<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="The abstract representation of a command line argument. Used to set all the options and relationships that define a valid argument for the program."><title>Arg in clap - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><linkrel="stylesheet"href="../static.files/normalize-76eba96aa4d2e634.css"><linkrel="stylesheet"href="../static.files/rustdoc-dd39b87e5fcfba68.css"><metaname="rustdoc-vars"data-root-path="../"data-static-root-path="../static.files/"data-current-crate="clap"data-themes=""data-resource-suffix=""data-rustdoc-version="1.80.0 (051478957 2024-07-21)"data-channel="1.80.0"data-search-js="search-d52510db62a78183.js"data-settings-js="settings-4313503d2e1961c2.js"><scriptsrc="../static.files/storage-118b08c4c78b968e.js"></script><scriptdefersrc="sidebar-items.js"></script><scriptdefersrc="../static.files/main-20a3ad099b048cf2.js"></script><noscript><linkrel="stylesheet"href="../static.files/noscript-df360f571f6edeae.css"></noscript><linkrel="alternate icon"type="image/png"href="../static.files/favicon-32x32-422f7d1d52889060.png"><linkrel="icon"type="image/svg+xml"href="../static.files/favicon-2c020d218678b618.svg"></head><bodyclass="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="mobile-topbar"><buttonclass="sidebar-menu-toggle"title="show sidebar"></button><aclass="logo-container"href="../clap/index.html"><imgsrc="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png"alt=""></a></nav><navclass="sidebar"><divclass="sidebar-crate"><aclass="logo-container"href="../clap/index.html"><imgsrc="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png"alt="logo"></a><h2><ahref="../clap/index.html">clap</a><spanclass="version">4.5.10</span></h2></div><h2class="location"><ahref="#">Arg</a></h2><divclass="sidebar-elems"><section><h3><ahref="#implementations">Methods</a></h3><ulclass="block method"><li><ahref="#method.action">action</a></li><li><ahref="#method.alias">alias</a></li><li><ahref="#method.aliases">aliases</a></li><li><ahref="#method.allow_hyphen_values">allow_hyphen_values</a></li><li><ahref="#method.allow_negative_numbers">allow_negative_numbers</a></li><li><ahref="#method.conflicts_with">conflicts_with</a></li><li><ahref="#method.conflicts_with_all">conflicts_with_all</a></li><li><ahref="#method.default_missing_value">default_missing_value</a></li><li><ahref="#method.default_missing_value_os">default_missing_value_os</a></li><li><ahref="#method.default_missing_values">default_missing_values</a></li><li><ahref="#method.default_missing_values_os">default_missing_values_os</a></li><li><ahref="#method.default_value">default_value</a></li><li><ahref="#method.default_value_if">default_value_if</a></li><li><ahref="#method.default_value_ifs">default_value_ifs</a></li><li><ahref="#method.default_values">default_values</a></li><li><ahref="#method.display_order">display_order</a></li><li><ahref="#method.exclusive">exclusive</a></li><li><ahref="#method.get_action">get_action</a></li><li><ahref="#method.get_aliases">get_aliases</a></li><li><ahref="#method.get_all_aliases">get_all_aliases</a></li><li><ahref="#method.get_all_short_aliases">get_all_short_aliases</a></li><li><ahref="#method.get_default_values">get_default_values</a></li><li><ahref="#method.get_help">get_help</a></li><li><ahref="#method.get_help_heading"
relationships that define a valid argument for the program.</p>
<p>There are two methods for constructing <ahref="struct.Arg.html"title="struct clap::Arg"><code>Arg</code></a>s, using the builder pattern and setting options
manually, or using a usage string which is far less verbose but has fewer options. You can also
use a combination of the two methods to achieve the best of both worlds.</p>
<divclass="example-wrap"><preclass="rust rust-example-rendered"><code><spanclass="comment">// Using the traditional builder pattern and setting each option manually
.help(<spanclass="string">"Provides a config file to myprog"</span>);
<spanclass="comment">// Using a usage string (setting a similar argument to the one above)
</span><spanclass="kw">let </span>input = <spanclass="macro">arg!</span>(-i --input <FILE><spanclass="string">"Provides an input file to the program"</span>);</code></pre></div>
<p>The name is used to check whether or not the argument was used at
runtime, get values, set relationships with other args, etc..</p>
<p><strong>NOTE:</strong> In the case of arguments that take values (i.e. <ahref="struct.Arg.html#method.action"title="method clap::Arg::action"><code>Arg::action(ArgAction::Set)</code></a>)
and positional arguments (i.e. those without a preceding <code>-</code> or <code>--</code>) the name will also
be displayed when the user prints the usage/help information of the program.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.id"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#119">source</a><h4class="code-header">pub fn <ahref="#method.id"class="fn">id</a>(self, id: impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="struct"href="struct.Id.html"title="struct clap::Id">Id</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Set the identifier used for referencing this argument in the clap API.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.short"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#171">source</a><h4class="code-header">pub fn <ahref="#method.short"class="fn">short</a>(self, s: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets the short version of the argument without the preceding <code>-</code>.</p>
<ahref="struct.Command.html#method.disable_version_flag"title="method clap::Command::disable_version_flag"><code>disable_version_flag</code></a>) and define your own.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.long"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#213">source</a><h4class="code-header">pub fn <ahref="#method.long"class="fn">long</a>(self, l: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.Str.html"title="struct clap::builder::Str">Str</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets the long version of the argument without the preceding <code>--</code>.</p>
<p>By default <code>version</code> and <code>help</code> are used by the auto-generated <code>version</code> and <code>help</code>
arguments, respectively. You may use the word <code>version</code> or <code>help</code> for the long form of your
own arguments, in which case <code>clap</code> simply will not assign those to the auto-generated
<code>version</code> or <code>help</code> arguments.</p>
<p><strong>NOTE:</strong> Any leading <code>-</code> characters will be stripped</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.alias"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#239">source</a><h4class="code-header">pub fn <ahref="#method.alias"class="fn">alias</a>(self, name: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.Str.html"title="struct clap::builder::Str">Str</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Add an alias, which functions as a hidden long flag.</p>
<p>This is more efficient, and easier than creating multiple hidden arguments as one only
needs to check for the existence of this command, and not all variants.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.short_alias"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#269">source</a><h4class="code-header">pub fn <ahref="#method.short_alias"class="fn">short_alias</a>(self, name: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Add an alias, which functions as a hidden short flag.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.visible_alias"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#360">source</a><h4class="code-header">pub fn <ahref="#method.visible_alias"class="fn">visible_alias</a>(self, name: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.Str.html"title="struct clap::builder::Str">Str</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Add an alias, which functions as a visible long flag.</p>
<p>Like <ahref="struct.Arg.html#method.alias"title="method clap::Arg::alias"><code>Arg::alias</code></a>, except that they are visible inside the help message.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.visible_short_alias"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#389">source</a><h4class="code-header">pub fn <ahref="#method.visible_short_alias"class="fn">visible_short_alias</a>(self, name: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Add an alias, which functions as a visible short flag.</p>
<p>Like <ahref="struct.Arg.html#method.short_alias"title="method clap::Arg::short_alias"><code>Arg::short_alias</code></a>, except that they are visible inside the help message.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Add aliases, which function as visible long flags.</p>
<p>Like <ahref="struct.Arg.html#method.aliases"title="method clap::Arg::aliases"><code>Arg::aliases</code></a>, except that they are visible inside the help message.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.visible_short_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#446">source</a><h4class="code-header">pub fn <ahref="#method.visible_short_aliases"class="fn">visible_short_aliases</a>(self, names: impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/iter/traits/collect/trait.IntoIterator.html"title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Add aliases, which function as visible short flags.</p>
<p>Like <ahref="struct.Arg.html#method.short_aliases"title="method clap::Arg::short_aliases"><code>Arg::short_aliases</code></a>, except that they are visible inside the help message.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.index"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#508">source</a><h4class="code-header">pub fn <ahref="#method.index"class="fn">index</a>(self, idx: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specifies the index of a positional argument <strong>starting at</strong> 1.</p>
<p><strong>NOTE:</strong> The index refers to position according to <strong>other positional argument</strong>. It does
not define position in the argument list as a whole.</p>
<p><strong>NOTE:</strong> You can optionally leave off the <code>index</code> method, and the index will be
assigned in order of evaluation. Utilizing the <code>index</code> method allows for setting
indexes out of order</p>
<p><strong>NOTE:</strong> This is only meant to be used for positional arguments and shouldn’t to be used
with <ahref="struct.Arg.html#method.short"title="method clap::Arg::short"><code>Arg::short</code></a> or <ahref="struct.Arg.html#method.long"title="method clap::Arg::long"><code>Arg::long</code></a>.</p>
<p><strong>NOTE:</strong> When utilized with [<code>Arg::num_args(1..)</code>], only the <strong>last</strong> positional argument
may be defined as having a variable number of arguments (i.e. with the highest index)</p>
<p><ahref="struct.Command.html"title="struct clap::Command"><code>Command</code></a> will <ahref="https://doc.rust-lang.org/1.80.0/std/macro.panic.html"title="macro std::panic"><code>panic!</code></a> if indexes are skipped (such as defining <code>index(1)</code> and <code>index(3)</code>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.trailing_var_arg"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#537">source</a><h4class="code-header">pub fn <ahref="#method.trailing_var_arg"class="fn">trailing_var_arg</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>This is a “var arg” and everything that follows should be captured by it, as if the user had
value), set <ahref="struct.Arg.html#method.allow_hyphen_values"title="method clap::Arg::allow_hyphen_values"><code>allow_hyphen_values</code></a>. Either way, users still
have the option to explicitly escape ambiguous arguments with <code>--</code>.</p>
<p><strong>NOTE:</strong><ahref="struct.Arg.html#method.value_delimiter"title="method clap::Arg::value_delimiter"><code>Arg::value_delimiter</code></a> still applies if set.</p>
<p><strong>NOTE:</strong> Setting this requires <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args"><code>Arg::num_args(..)</code></a>.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.last"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#626">source</a><h4class="code-header">pub fn <ahref="#method.last"class="fn">last</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>This arg is the last, or final, positional argument (i.e. has the highest
index) and is <em>only</em> able to be accessed via the <code>--</code> syntax (i.e. <code>$ prog args -- last_arg</code>).</p>
<p>Even, if no other arguments are left to parse, if the user omits the <code>--</code> syntax
they will receive an <ahref="error/enum.ErrorKind.html#variant.UnknownArgument"title="variant clap::error::ErrorKind::UnknownArgument"><code>UnknownArgument</code></a> error. Setting an argument to <code>.last(true)</code> also
allows one to access this arg early using the <code>--</code> syntax. Accessing an arg early, even with
the <code>--</code> syntax is otherwise not possible.</p>
<p><strong>NOTE:</strong> This will change the usage string to look like <code>$ prog [OPTIONS] [-- <ARG>]</code> if
<code>ARG</code> is marked as <code>.last(true)</code>.</p>
<p><strong>NOTE:</strong> This setting will imply <ahref="struct.Command.html#method.dont_collapse_args_in_usage"title="method clap::Command::dont_collapse_args_in_usage"><code>crate::Command::dont_collapse_args_in_usage</code></a> because failing
to set this can make the usage string very confusing.</p>
<p><strong>NOTE</strong>: This setting only applies to positional arguments, and has no effect on OPTIONS</p>
<p><strong>NOTE:</strong> Setting this requires <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args">taking values</a></p>
<p><strong>CAUTION:</strong> Using this setting <em>and</em> having child subcommands is not
recommended with the exception of <em>also</em> using
(or <ahref="struct.Command.html#method.subcommand_negates_reqs"title="method clap::Command::subcommand_negates_reqs"><code>crate::Command::subcommand_negates_reqs</code></a> if the argument marked <code>Last</code> is also
<p>Setting <code>last</code> ensures the arg has the highest <ahref="struct.Arg.html#method.index"title="method clap::Arg::index">index</a> of all positional args
and requires that the <code>--</code> syntax be used to access it early.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.required"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#692">source</a><h4class="code-header">pub fn <ahref="#method.required"class="fn">required</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specifies that the argument must be present.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.requires"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#758">source</a><h4class="code-header">pub fn <ahref="#method.requires"class="fn">requires</a>(self, arg_id: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="struct.Id.html"title="struct clap::Id">Id</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets an argument that is required when this one is present</p>
<p>i.e. when using this argument, the following argument <em>must</em> be present.</p>
<p><strong>NOTE:</strong><ahref="struct.Arg.html#method.conflicts_with"title="method clap::Arg::conflicts_with">Conflicting</a> rules and <ahref="struct.Arg.html#method.overrides_with"title="method clap::Arg::overrides_with">override</a> rules take precedence over being required</p>
<p>Setting <ahref="struct.Arg.html#method.requires"title="method clap::Arg::requires"><code>Arg::requires(name)</code></a> requires that the argument be used at runtime if the
defining argument is used. If the defining argument isn’t used, the other argument isn’t
<spanclass="macro">assert!</span>(res.is_ok()); <spanclass="comment">// We didn't use cfg, so input wasn't required</span></code></pre></div>
<p>Setting <ahref="struct.Arg.html#method.requires"title="method clap::Arg::requires"><code>Arg::requires(name)</code></a> and <em>not</em> supplying that argument is an error.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.exclusive"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#802">source</a><h4class="code-header">pub fn <ahref="#method.exclusive"class="fn">exclusive</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>This argument must be passed alone; it conflicts with all other arguments.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.global"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#846">source</a><h4class="code-header">pub fn <ahref="#method.global"class="fn">global</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specifies that an argument can be matched to all child <ahref="trait.Subcommand.html"title="trait clap::Subcommand"><code>Subcommand</code></a>s.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.value_parser"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#969">source</a><h4class="code-header">pub fn <ahref="#method.value_parser"class="fn">value_parser</a>(self, parser: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.ValueParser.html"title="struct clap::builder::ValueParser">ValueParser</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specify the typed behavior of the argument.</p>
<p>This allows parsing and validating a value before storing it into
<ahref="struct.ArgMatches.html"title="struct clap::ArgMatches"><code>ArgMatches</code></a> as the given type.</p>
<p>Possible value parsers include:</p>
<ul>
<li><ahref="macro.value_parser.html"title="macro clap::value_parser"><code>value_parser!(T)</code></a> for auto-selecting a value parser for a given type
<li>Or <ahref="https://doc.rust-lang.org/1.80.0/core/ops/range/trait.RangeBounds.html"title="trait core::ops::range::RangeBounds">range expressions like <code>0..=1</code></a> as a shorthand for <ahref="builder/struct.RangedI64ValueParser.html"title="struct clap::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a></li>
<li><code>[&str]</code> and <ahref="builder/struct.PossibleValuesParser.html"title="struct clap::builder::PossibleValuesParser"><code>PossibleValuesParser</code></a> for static enumerated values</li>
<li><ahref="builder/struct.BoolishValueParser.html"title="struct clap::builder::BoolishValueParser"><code>BoolishValueParser</code></a>, and <ahref="builder/struct.FalseyValueParser.html"title="struct clap::builder::FalseyValueParser"><code>FalseyValueParser</code></a> for alternative <code>bool</code> implementations</li>
<li><ahref="builder/struct.NonEmptyStringValueParser.html"title="struct clap::builder::NonEmptyStringValueParser"><code>NonEmptyStringValueParser</code></a> for basic validation for strings</li>
<li>or any other <ahref="builder/trait.TypedValueParser.html"title="trait clap::builder::TypedValueParser"><code>TypedValueParser</code></a> implementation</li>
</ul>
<p>The default value is <ahref="builder/struct.ValueParser.html#method.string"title="associated function clap::builder::ValueParser::string"><code>ValueParser::string</code></a>.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.num_args"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1126">source</a><h4class="code-header">pub fn <ahref="#method.num_args"class="fn">num_args</a>(self, qty: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.ValueRange.html"title="struct clap::builder::ValueRange">ValueRange</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specifies the number of arguments parsed per occurrence</p>
<p>For example, if you had a <code>-f <file></code> argument where you wanted exactly 3 ‘files’ you would
set <code>.num_args(3)</code>, and this argument wouldn’t be satisfied unless the user
provided 3 and only 3 values.</p>
<p>Users may specify values for arguments in any of the following methods</p>
<ul>
<li>Using a space such as <code>-o value</code> or <code>--option value</code></li>
<li>Using an equals and no space such as <code>-o=value</code> or <code>--option=value</code></li>
<li>Use a short and no space such as <code>-ovalue</code></li>
</ul>
<p><strong>WARNING:</strong></p>
<p>Setting a variable number of values (e.g. <code>1..=10</code>) for an argument without
other details can be dangerous in some circumstances. Because multiple values are
allowed, <code>--option val1 val2 val3</code> is perfectly valid. Be careful when designing a CLI
where <strong>positional arguments</strong> or <strong>subcommands</strong> are <em>also</em> expected as <code>clap</code> will continue
parsing <em>values</em> until one of the following happens:</p>
<ul>
<li>It reaches the maximum number of values</li>
<li>It reaches a specific number of values</li>
<li>It finds another flag or option (i.e. something that starts with a <code>-</code>)</li>
<li>It reaches the <ahref="struct.Arg.html#method.value_terminator"title="method clap::Arg::value_terminator"><code>Arg::value_terminator</code></a> if set</li>
<li>Use a delimiter between values with <ahref="struct.Arg.html#method.value_delimiter"title="method clap::Arg::value_delimiter"><code>Arg::value_delimiter</code></a></li>
<li>Require a flag occurrence per value with <ahref="enum.ArgAction.html#variant.Append"title="variant clap::ArgAction::Append"><code>ArgAction::Append</code></a></li>
<li>Require positional arguments to appear after <code>--</code> with <ahref="struct.Arg.html#method.last"title="method clap::Arg::last"><code>Arg::last</code></a></li>
<p>Flag/option hybrid (see also <ahref="struct.Arg.html#method.default_missing_value"title="method clap::Arg::default_missing_value"><code>default_missing_value</code></a>)</p>
<p>The problem is <code>clap</code> doesn’t know when to stop parsing values for “file”.</p>
<p>A solution for the example above is to limit how many values with a maximum, or specific
number, or to say <ahref="enum.ArgAction.html#variant.Append"title="variant clap::ArgAction::Append"><code>ArgAction::Append</code></a> is ok, but multiple values are not.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.value_name"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1190">source</a><h4class="code-header">pub fn <ahref="#method.value_name"class="fn">value_name</a>(self, name: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.Str.html"title="struct clap::builder::Str">Str</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Placeholder for the argument’s value in the help message / usage.</p>
<p>This name is cosmetic only; the name is <strong>not</strong> used to access arguments.
This setting can be very helpful when describing the type of input the user should be
using, such as <code>FILE</code>, <code>INTERFACE</code>, etc. Although not required, it’s somewhat convention to
<p>These names are cosmetic only, used for help and usage strings only. The names are <strong>not</strong>
used to access arguments. The values of the arguments are accessed in numeric order (i.e.
if you specify two names <code>one</code> and <code>two</code><code>one</code> will be the first matched value, <code>two</code> will
be the second).</p>
<p>This setting can be very helpful when describing the type of input the user should be
using, such as <code>FILE</code>, <code>INTERFACE</code>, etc. Although not required, it’s somewhat convention to
use all capital letters for the value name.</p>
<p><strong>Pro Tip:</strong> It may help to use <ahref="struct.Arg.html#method.next_line_help"title="method clap::Arg::next_line_help"><code>Arg::next_line_help(true)</code></a> if there are long, or
multiple value names in order to not throw off the help text alignment of all options.</p>
<p><strong>NOTE:</strong> implicitly sets <ahref="struct.Arg.html#method.action"title="method clap::Arg::action"><code>Arg::action(ArgAction::Set)</code></a> and <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args"><code>Arg::num_args(1..)</code></a>.</p>
--io-files <INFILE><OUTFILE> Some help text
-V, --version Print version information
</code></pre></div></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.value_hint"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1293">source</a><h4class="code-header">pub fn <ahref="#method.value_hint"class="fn">value_hint</a>(self, value_hint: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="enum"href="enum.ValueHint.html"title="enum clap::ValueHint">ValueHint</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Provide the shell a hint about how to complete this argument.</p>
<p>See <ahref="enum.ValueHint.html"title="enum clap::ValueHint"><code>ValueHint</code></a> for more information.</p>
<p>When other arguments are conditionally required based on the
value of a case-insensitive argument, the equality check done
by <ahref="struct.Arg.html#method.required_if_eq"title="method clap::Arg::required_if_eq"><code>Arg::required_if_eq</code></a>, <ahref="struct.Arg.html#method.required_if_eq_any"title="method clap::Arg::required_if_eq_any"><code>Arg::required_if_eq_any</code></a>, or
<ahref="struct.Arg.html#method.required_if_eq_all"title="method clap::Arg::required_if_eq_all"><code>Arg::required_if_eq_all</code></a> is case-insensitive.</p>
<p><strong>NOTE:</strong> Setting this requires <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args">taking values</a></p>
<p><strong>NOTE:</strong> To do unicode case folding, enable the <code>unicode</code> feature flag.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.allow_hyphen_values"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1414">source</a><h4class="code-header">pub fn <ahref="#method.allow_hyphen_values"class="fn">allow_hyphen_values</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Allows values which start with a leading hyphen (<code>-</code>)</p>
<p>See also <ahref="struct.Arg.html#method.trailing_var_arg"title="method clap::Arg::trailing_var_arg"><code>trailing_var_arg</code></a>.</p>
<p><strong>NOTE:</strong> Setting this requires <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args">taking values</a></p>
<p><strong>WARNING:</strong> Prior arguments with <code>allow_hyphen_values(true)</code> get precedence over known
flags but known flags get precedence over the next possible positional argument with
<code>allow_hyphen_values(true)</code>. When combined with [<code>Arg::num_args(..)</code>],
<ahref="struct.Arg.html#method.value_terminator"title="method clap::Arg::value_terminator"><code>Arg::value_terminator</code></a> is one way to ensure processing stops.</p>
<p><strong>WARNING</strong>: Take caution when using this setting combined with another argument using
<ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args"><code>Arg::num_args</code></a>, as this becomes ambiguous <code>$ prog --arg -- -- val</code>. All
three <code>--, --, val</code> will be values when the user may have thought the second <code>--</code> would
constitute the normal, “Only positional args follow” idiom.</p>
<p>This is similar to <ahref="struct.Arg.html#method.allow_hyphen_values"title="method clap::Arg::allow_hyphen_values"><code>Arg::allow_hyphen_values</code></a> except that it only allows numbers,
all other undefined leading hyphens will fail to parse.</p>
<p><strong>NOTE:</strong> Setting this requires <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args">taking values</a></p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.require_equals"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1498">source</a><h4class="code-header">pub fn <ahref="#method.require_equals"class="fn">require_equals</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Requires that options use the <code>--option=val</code> syntax</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.value_terminator"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1603">source</a><h4class="code-header">pub fn <ahref="#method.value_terminator"class="fn">value_terminator</a>(self, term: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.Str.html"title="struct clap::builder::Str">Str</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sentinel to <strong>stop</strong> parsing multiple values of a given argument.</p>
<p>By default when
one sets <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args"><code>num_args(1..)</code></a> on an argument, clap will continue parsing values for that
argument until it reaches another valid argument, or one of the other more specific settings
for multiple values is used (such as <ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args"><code>num_args</code></a>).</p>
<p><strong>NOTE:</strong> This setting only applies to <ahref="struct.Arg.html#method.action"title="method clap::Arg::action">options</a> and <ahref="struct.Arg.html#method.index"title="method clap::Arg::index">positional arguments</a></p>
<p><strong>NOTE:</strong> When the terminator is passed in on the command line, it is <strong>not</strong> stored as one
<p>Will result in everything after <code>--</code> to be considered one raw argument. This behavior
may not be exactly what you are expecting and using <ahref="struct.Arg.html#method.trailing_var_arg"title="method clap::Arg::trailing_var_arg"><code>Arg::trailing_var_arg</code></a>
<ahref="struct.Arg.html#method.allow_hyphen_values"title="method clap::Arg::allow_hyphen_values"><code>Arg::allow_hyphen_values(true)</code></a>, and <ahref="struct.Arg.html#method.last"title="method clap::Arg::last"><code>Arg::last(true)</code></a> when set to <code>true</code>.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.default_value"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1697">source</a><h4class="code-header">pub fn <ahref="#method.default_value"class="fn">default_value</a>(self, val: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.OsStr.html"title="struct clap::builder::OsStr">OsStr</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Value for the argument when not present.</p>
<p><strong>NOTE:</strong> If the user <em>does not</em> use this argument at runtime <ahref="struct.ArgMatches.html#method.contains_id"title="method clap::ArgMatches::contains_id"><code>ArgMatches::contains_id</code></a> will
still return <code>true</code>. If you wish to determine whether the argument was used at runtime or
<p><strong>NOTE:</strong> This setting is perfectly compatible with <ahref="struct.Arg.html#method.default_value_if"title="method clap::Arg::default_value_if"><code>Arg::default_value_if</code></a> but slightly
different. <code>Arg::default_value</code><em>only</em> takes effect when the user has not provided this arg
at runtime. <code>Arg::default_value_if</code> however only takes effect when the user has not provided
a value at runtime <strong>and</strong> these other conditions are met as well. If you have set
<code>Arg::default_value</code> and <code>Arg::default_value_if</code>, and the user <strong>did not</strong> provide this arg
at runtime, nor were the conditions met for <code>Arg::default_value_if</code>, the <code>Arg::default_value</code>
will be applied.</p>
<p>Like with command-line values, this will be split by <ahref="struct.Arg.html#method.value_delimiter"title="method clap::Arg::value_delimiter"><code>Arg::value_delimiter</code></a>.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Value for the argument when not present.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.default_missing_value"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1835">source</a><h4class="code-header">pub fn <ahref="#method.default_missing_value"class="fn">default_missing_value</a>(self, val: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.OsStr.html"title="struct clap::builder::OsStr">OsStr</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Value for the argument when the flag is present but no value is specified.</p>
<p>This configuration option is often used to give the user a shortcut and allow them to
efficiently specify an option argument without requiring an explicitly value. The <code>--color</code>
the user can quickly just add <code>--color</code> to the command line to produce the desired color output.</p>
<p><strong>NOTE:</strong> using this configuration option requires the use of the
<ahref="struct.Arg.html#method.num_args"title="method clap::Arg::num_args"><code>.num_args(0..N)</code></a> and the
<ahref="struct.Arg.html#method.require_equals"title="method clap::Arg::require_equals"><code>.require_equals(true)</code></a> configuration option. These are required in
order to unambiguously determine what, if any, value was supplied for the argument.</p>
<p>Like with command-line values, this will be split by <ahref="struct.Arg.html#method.value_delimiter"title="method clap::Arg::value_delimiter"><code>Arg::value_delimiter</code></a>.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.default_missing_value_os"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#1852">source</a><h4class="code-header">pub fn <ahref="#method.default_missing_value_os"class="fn">default_missing_value_os</a>(self, val: impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="struct"href="builder/struct.OsStr.html"title="struct clap::builder::OsStr">OsStr</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Value for the argument when the flag is present but no value is specified.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Value for the argument when the flag is present but no value is specified.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Value for the argument when the flag is present but no value is specified.</p>
</div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Arg-2"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2060">source</a><ahref="#impl-Arg-2"class="anchor">§</a><h3class="code-header">impl <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></summary><divclass="docblock"><h4id="help-1"><aclass="doc-anchor"href="#help-1">§</a>Help</h4></div><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.help"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2107">source</a><h4class="code-header">pub fn <ahref="#method.help"class="fn">help</a>(self, h: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.StyledStr.html"title="struct clap::builder::StyledStr">StyledStr</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets the description of the argument for short help (<code>-h</code>).</p>
<p>Typically, this is a short (one line) description of the arg.</p>
<p>If <ahref="struct.Arg.html#method.long_help"title="method clap::Arg::long_help"><code>Arg::long_help</code></a> is not specified, this message will be displayed for <code>--help</code>.</p>
<p><strong>NOTE:</strong> Only <code>Arg::help</code> is used in completion script generation in order to be concise</p>
--config Some help text describing the --config arg
-h, --help Print help information
-V, --version Print version information
</code></pre></div></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.long_help"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2171">source</a><h4class="code-header">pub fn <ahref="#method.long_help"class="fn">long_help</a>(self, h: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="builder/struct.StyledStr.html"title="struct clap::builder::StyledStr">StyledStr</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets the description of the argument for long help (<code>--help</code>).</p>
<p>Typically this a more detailed (multi-line) message
that describes the arg.</p>
<p>If <ahref="struct.Arg.html#method.help"title="method clap::Arg::help"><code>Arg::help</code></a> is not specified, this message will be displayed for <code>-h</code>.</p>
<p><strong>NOTE:</strong> Only <ahref="struct.Arg.html#method.help"title="method clap::Arg::help"><code>Arg::help</code></a> is used in completion script generation in order to be concise</p>
</code></pre></div></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.display_order"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2238">source</a><h4class="code-header">pub fn <ahref="#method.display_order"class="fn">display_order</a>(self, ord: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Allows custom ordering of args within the help message.</p>
Overriding this is helpful when the order arguments are added in isn’t the same as the
display order, whether in one-off cases or to automatically sort arguments.</p>
<p>To change, see <ahref="struct.Command.html#method.next_display_order"title="method clap::Command::next_display_order"><code>Command::next_display_order</code></a>.</p>
<p><strong>NOTE:</strong> This setting is ignored for <ahref="struct.Arg.html#method.index"title="method clap::Arg::index">positional arguments</a> which are always displayed in
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.next_line_help"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2300">source</a><h4class="code-header">pub fn <ahref="#method.next_line_help"class="fn">next_line_help</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Render the <ahref="struct.Arg.html#method.help"title="method clap::Arg::help">help</a> on the line after the argument.</p>
</code></pre></div></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.hide"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2344">source</a><h4class="code-header">pub fn <ahref="#method.hide"class="fn">hide</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Do not display the argument in help message.</p>
</code></pre></div></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.hide_possible_values"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2378">source</a><h4class="code-header">pub fn <ahref="#method.hide_possible_values"class="fn">hide_possible_values</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Do not display the <ahref="builder/struct.ValueParser.html#method.possible_values"title="method clap::builder::ValueParser::possible_values">possible values</a> in the help message.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.hide_default_value"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2410">source</a><h4class="code-header">pub fn <ahref="#method.hide_default_value"class="fn">hide_default_value</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Do not display the default value of the argument in the help message.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.hide_short_help"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2555">source</a><h4class="code-header">pub fn <ahref="#method.hide_short_help"class="fn">hide_short_help</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Hides an argument from short help (<code>-h</code>).</p>
</code></pre></div></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.hide_long_help"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#2632">source</a><h4class="code-header">pub fn <ahref="#method.hide_long_help"class="fn">hide_long_help</a>(self, yes: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Hides an argument from long help (<code>--help</code>).</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specifies the value of the argument if <code>arg</code> has been used at runtime.</p>
<p>If <code>default</code> is set to <code>None</code>, <code>default_value</code> will be removed.</p>
<p><strong>NOTE:</strong> This setting is perfectly compatible with <ahref="struct.Arg.html#method.default_value"title="method clap::Arg::default_value"><code>Arg::default_value</code></a> but slightly
different. <code>Arg::default_value</code><em>only</em> takes effect when the user has not provided this arg
at runtime. This setting however only takes effect when the user has not provided a value at
runtime <strong>and</strong> these other conditions are met as well. If you have set <code>Arg::default_value</code>
and <code>Arg::default_value_if</code>, and the user <strong>did not</strong> provide this arg at runtime, nor were
the conditions met for <code>Arg::default_value_if</code>, the <code>Arg::default_value</code> will be applied.</p>
<p>Like with command-line values, this will be split by <ahref="struct.Arg.html#method.value_delimiter"title="method clap::Arg::value_delimiter"><code>Arg::value_delimiter</code></a>.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specifies multiple values and conditions in the same manner as <ahref="struct.Arg.html#method.default_value_if"title="method clap::Arg::default_value_if"><code>Arg::default_value_if</code></a>.</p>
<p>The method takes a slice of tuples in the <code>(arg, predicate, default)</code> format.</p>
<p><strong>NOTE</strong>: The conditions are stored in order and evaluated in the same order. I.e. the first
if multiple conditions are true, the first one found will be applied and the ultimate value.</p>
<p>Like with command-line values, this will be split by <ahref="struct.Arg.html#method.value_delimiter"title="method clap::Arg::value_delimiter"><code>Arg::value_delimiter</code></a>.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.required_unless_present"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3056">source</a><h4class="code-header">pub fn <ahref="#method.required_unless_present"class="fn">required_unless_present</a>(self, arg_id: impl <aclass="trait"href="builder/trait.IntoResettable.html"title="trait clap::builder::IntoResettable">IntoResettable</a><<aclass="struct"href="struct.Id.html"title="struct clap::Id">Id</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Set this arg as <ahref="struct.Arg.html#method.required"title="method clap::Arg::required">required</a> as long as the specified argument is not present at runtime.</p>
<p><strong>Pro Tip:</strong> Using <code>Arg::required_unless_present</code> implies <ahref="struct.Arg.html#method.required"title="method clap::Arg::required"><code>Arg::required</code></a> and is therefore not
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets this arg as <ahref="struct.Arg.html#method.required"title="method clap::Arg::required">required</a> unless <em>all</em> of the specified arguments are present at runtime.</p>
<p>In other words, parsing will succeed only if user either</p>
<ul>
<li>supplies the <code>self</code> arg.</li>
<li>supplies <em>all</em> of the <code>names</code> arguments.</li>
</ul>
<p><strong>NOTE:</strong> If you wish for this argument to only be required unless <em>any of</em> these args are
present see <ahref="struct.Arg.html#method.required_unless_present_any"title="method clap::Arg::required_unless_present_any"><code>Arg::required_unless_present_any</code></a></p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets this arg as <ahref="struct.Arg.html#method.required"title="method clap::Arg::required">required</a> unless <em>any</em> of the specified arguments are present at runtime.</p>
<p>In other words, parsing will succeed only if user either</p>
<ul>
<li>supplies the <code>self</code> arg.</li>
<li>supplies <em>one or more</em> of the <code>unless</code> arguments.</li>
</ul>
<p><strong>NOTE:</strong> If you wish for this argument to be required unless <em>all of</em> these args are
present see <ahref="struct.Arg.html#method.required_unless_present_all"title="method clap::Arg::required_unless_present_all"><code>Arg::required_unless_present_all</code></a></p>
<p>Setting <ahref="struct.Arg.html#method.required_unless_present_any"title="method clap::Arg::required_unless_present_any"><code>Arg::required_unless_present_any(names)</code></a> requires that the argument be used at runtime
<em>unless</em><em>at least one of</em> the args in <code>names</code> are present. In the following example, the
required argument is <em>not</em> provided, but it’s not an error because one the <code>unless</code> args
<p>Setting <ahref="struct.Arg.html#method.required_unless_present_any"title="method clap::Arg::required_unless_present_any"><code>Arg::required_unless_present_any(names)</code></a> and <em>not</em> supplying <em>at least one of</em><code>names</code>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.required_if_eq"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3307">source</a><h4class="code-header">pub fn <ahref="#method.required_if_eq"class="fn">required_if_eq</a>(self, arg_id: impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="struct"href="struct.Id.html"title="struct clap::Id">Id</a>>, val: impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="struct"href="builder/struct.OsStr.html"title="struct clap::builder::OsStr">OsStr</a>>) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>This argument is <ahref="struct.Arg.html#method.required"title="method clap::Arg::required">required</a> only if the specified <code>arg</code> is present at runtime and its value
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specify this argument is <ahref="struct.Arg.html#method.required"title="method clap::Arg::required">required</a> based on multiple conditions.</p>
<p>The conditions are set up in a <code>(arg, val)</code> style tuple. The requirement will only become
valid if one of the specified <code>arg</code>’s value equals its corresponding <code>val</code>.</p>
<spanclass="macro">assert!</span>(res.is_ok()); <spanclass="comment">// We didn't use --option=spec, or --extra=val so "cfg" isn't required</span></code></pre></div>
<p>Setting <code>Arg::required_if_eq_any([(arg, val)])</code> and having any of the <code>arg</code>s used with its
value of <code>val</code> but <em>not</em> using this arg is an error.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Specify this argument is <ahref="struct.Arg.html#method.required"title="method clap::Arg::required">required</a> based on multiple conditions.</p>
<p>The conditions are set up in a <code>(arg, val)</code> style tuple. The requirement will only become
valid if every one of the specified <code>arg</code>’s value equals its corresponding <code>val</code>.</p>
<spanclass="macro">assert!</span>(res.is_ok()); <spanclass="comment">// We didn't use --option=spec --extra=val so "cfg" isn't required</span></code></pre></div>
<p>Setting <code>Arg::required_if_eq_all([(arg, val)])</code> and having all of the <code>arg</code>s used with its
value of <code>val</code> but <em>not</em> using this arg is an error.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Require another argument if this arg matches the <ahref="builder/enum.ArgPredicate.html"title="enum clap::builder::ArgPredicate"><code>ArgPredicate</code></a></p>
<p>This method takes <code>value, another_arg</code> pair. At runtime, clap will check
if this arg (<code>self</code>) matches the <ahref="builder/enum.ArgPredicate.html"title="enum clap::builder::ArgPredicate"><code>ArgPredicate</code></a>.
If it does, <code>another_arg</code> will be marked as required.</p>
<spanclass="macro">assert!</span>(res.is_ok()); <spanclass="comment">// We didn't use --config=my.cfg, so other wasn't required</span></code></pre></div>
<p>Setting <code>Arg::requires_if(val, arg)</code> and setting the value to <code>val</code> but <em>not</em> supplying
<p>Setting <code>Arg::requires_ifs</code> with <ahref="builder/enum.ArgPredicate.html#variant.IsPresent"title="variant clap::builder::ArgPredicate::IsPresent"><code>ArgPredicate::IsPresent</code></a> and <em>not</em> supplying all the
<p><strong>NOTE:</strong><ahref="struct.Arg.html#method.conflicts_with_all"title="method clap::Arg::conflicts_with_all"><code>Arg::conflicts_with_all(names)</code></a> allows specifying an argument which conflicts with more than one argument.</p>
<p><strong>NOTE</strong><ahref="struct.Arg.html#method.exclusive"title="method clap::Arg::exclusive"><code>Arg::exclusive(true)</code></a> allows specifying an argument which conflicts with every other argument.</p>
<p><strong>NOTE:</strong> All arguments implicitly conflict with themselves.</p>
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>This argument is mutually exclusive with the specified arguments.</p>
<p><strong>NOTE:</strong><ahref="struct.Arg.html#method.exclusive"title="method clap::Arg::exclusive"><code>Arg::exclusive(true)</code></a> allows specifying an argument which conflicts with every other argument.</p>
will override each other in POSIX style (whichever argument was specified at runtime
<strong>last</strong> “wins”)</p>
<p><strong>NOTE:</strong> When an argument is overridden it is essentially as if it never was used, any
conflicts, requirements, etc. are evaluated <strong>after</strong> all “overrides” have been removed</p>
<p><strong>NOTE:</strong> Overriding an argument implies they <ahref="struct.Arg.html#method.conflicts_with"title="method clap::Arg::conflicts_with">conflict</a>.</p>
<spanclass="macro">assert!</span>(m.get_flag(<spanclass="string">"debug"</span>)); <spanclass="comment">// even though flag conflicts with debug, it's as if flag
// was never used because it was overridden with color
) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass="docblock"><p>Sets multiple mutually overridable arguments by name.</p>
<p>i.e. this argument and the following argument will override each other in POSIX style
(whichever argument was specified at runtime <strong>last</strong> “wins”)</p>
<p><strong>NOTE:</strong> When an argument is overridden it is essentially as if it never was used, any
conflicts, requirements, etc. are evaluated <strong>after</strong> all “overrides” have been removed</p>
<p><strong>NOTE:</strong> Overriding an argument implies they <ahref="struct.Arg.html#method.conflicts_with_all"title="method clap::Arg::conflicts_with_all">conflict</a>.</p>
<spanclass="comment">// ^~~~~~^~~~~~~~~ flag and debug are overridden by color
</span><spanclass="macro">assert!</span>(m.get_flag(<spanclass="string">"color"</span>)); <spanclass="comment">// even though flag conflicts with color, it's as if flag
// and debug were never used because they were overridden
</div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Arg-4"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3828">source</a><ahref="#impl-Arg-4"class="anchor">§</a><h3class="code-header">impl <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></summary><divclass="docblock"><h4id="reflection"><aclass="doc-anchor"href="#reflection">§</a>Reflection</h4></div><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_id"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3831">source</a><h4class="code-header">pub fn <ahref="#method.get_id"class="fn">get_id</a>(&self) ->&<aclass="struct"href="struct.Id.html"title="struct clap::Id">Id</a></h4></section></summary><divclass="docblock"><p>Get the name of the argument</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_help"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3837">source</a><h4class="code-header">pub fn <ahref="#method.get_help"class="fn">get_help</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&<aclass="struct"href="builder/struct.StyledStr.html"title="struct clap::builder::StyledStr">StyledStr</a>></h4></section></summary><divclass="docblock"><p>Get the help specified for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_long_help"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3853">source</a><h4class="code-header">pub fn <ahref="#method.get_long_help"class="fn">get_long_help</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&<aclass="struct"href="builder/struct.StyledStr.html"title="struct clap::builder::StyledStr">StyledStr</a>></h4></section></summary><divclass="docblock"><p>Get the long help specified for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_help_heading"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3859">source</a><h4class="code-header">pub fn <ahref="#method.get_help_heading"class="fn">get_help_heading</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.str.html">str</a>></h4></section></summary><divclass="docblock"><p>Get the help heading specified for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_short"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3868">source</a><h4class="code-header">pub fn <ahref="#method.get_short"class="fn">get_short</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>></h4></section></summary><divclass="docblock"><p>Get the short option name for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_visible_short_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3874">source</a><h4class="code-header">pub fn <ahref="#method.get_visible_short_aliases"class="fn">get_visible_short_aliases</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>>></h4></section></summary><divclass="docblock"><p>Get visible short aliases for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_all_short_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3890">source</a><h4class="code-header">pub fn <ahref="#method.get_all_short_aliases"class="fn">get_all_short_aliases</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>>></h4></section></summary><divclass="docblock"><p>Get <em>all</em> short aliases for this argument, if any, both visible and hidden.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_short_and_visible_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3900">source</a><h4class="code-header">pub fn <ahref="#method.get_short_and_visible_aliases"class="fn">get_short_and_visible_aliases</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>>></h4></section></summary><divclass="docblock"><p>Get the short option name and its visible aliases, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_long"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3913">source</a><h4class="code-header">pub fn <ahref="#method.get_long"class="fn">get_long</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.str.html">str</a>></h4></section></summary><divclass="docblock"><p>Get the long option name for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_visible_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3919">source</a><h4class="code-header">pub fn <ahref="#method.get_visible_aliases"class="fn">get_visible_aliases</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><&<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.str.html">str</a>>></h4></section></summary><divclass="docblock"><p>Get visible aliases for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_all_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3934">source</a><h4class="code-header">pub fn <ahref="#method.get_all_aliases"class="fn">get_all_aliases</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><&<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.str.html">str</a>>></h4></section></summary><divclass="docblock"><p>Get <em>all</em> aliases for this argument, if any, both visible and hidden.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_long_and_visible_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3944">source</a><h4class="code-header">pub fn <ahref="#method.get_long_and_visible_aliases"class="fn">get_long_and_visible_aliases</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><&<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.str.html">str</a>>></h4></section></summary><divclass="docblock"><p>Get the long option name and its visible aliases, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_aliases"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3957">source</a><h4class="code-header">pub fn <ahref="#method.get_aliases"class="fn">get_aliases</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><&<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.str.html">str</a>>></h4></section></summary><divclass="docblock"><p>Get hidden aliases for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_possible_values"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3972">source</a><h4class="code-header">pub fn <ahref="#method.get_possible_values"class="fn">get_possible_values</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><<aclass="struct"href="builder/struct.PossibleValue.html"title="struct clap::builder::PossibleValue">PossibleValue</a>></h4></section></summary><divclass="docblock"><p>Get the names of possible values for this argument. Only useful for user
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_value_names"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3985">source</a><h4class="code-header">pub fn <ahref="#method.get_value_names"class="fn">get_value_names</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&[<aclass="struct"href="builder/struct.Str.html"title="struct clap::builder::Str">Str</a>]></h4></section></summary><divclass="docblock"><p>Get the names of values for this argument.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_num_args"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#3995">source</a><h4class="code-header">pub fn <ahref="#method.get_num_args"class="fn">get_num_args</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="builder/struct.ValueRange.html"title="struct clap::builder::ValueRange">ValueRange</a>></h4></section></summary><divclass="docblock"><p>Get the number of values for this argument.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_value_delimiter"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4006">source</a><h4class="code-header">pub fn <ahref="#method.get_value_delimiter"class="fn">get_value_delimiter</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.char.html">char</a>></h4></section></summary><divclass="docblock"><p>Get the delimiter between multiple values</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_value_terminator"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4013">source</a><h4class="code-header">pub fn <ahref="#method.get_value_terminator"class="fn">get_value_terminator</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><&<aclass="struct"href="builder/struct.Str.html"title="struct clap::builder::Str">Str</a>></h4></section></summary><divclass="docblock"><p>Get the value terminator for this argument. The <code>value_terminator</code> is a value
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_index"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4019">source</a><h4class="code-header">pub fn <ahref="#method.get_index"class="fn">get_index</a>(&self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>></h4></section></summary><divclass="docblock"><p>Get the index of this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_value_hint"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4024">source</a><h4class="code-header">pub fn <ahref="#method.get_value_hint"class="fn">get_value_hint</a>(&self) -><aclass="enum"href="enum.ValueHint.html"title="enum clap::ValueHint">ValueHint</a></h4></section></summary><divclass="docblock"><p>Get the value hint of this argument</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.get_default_values"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4065">source</a><h4class="code-header">pub fn <ahref="#method.get_default_values"class="fn">get_default_values</a>(&self) ->&[<aclass="struct"href="builder/struct.OsStr.html"title="struct clap::builder::OsStr">OsStr</a>]</h4></section></summary><divclass="docblock"><p>Get the default values specified for this argument, if any</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.is_positional"class="method"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4082">source</a><h4class="code-header">pub fn <ahref="#method.is_positional"class="fn">is_positional</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass="docblock"><p>Checks whether this argument is a positional or not.</p>
</div></details></div></details><sectionid="impl-Arg-5"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4216">source</a><ahref="#impl-Arg-5"class="anchor">§</a><h3class="code-header">impl <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section><divclass="item-info"><divclass="stab empty-impl">This impl block contains no items.</div></div><divclass="docblock"><h4id="internally-used-only"><aclass="doc-anchor"href="#internally-used-only">§</a>Internally used only</h4></div></div><h2id="trait-implementations"class="section-header">Trait Implementations<ahref="#trait-implementations"class="anchor">§</a></h2><divid="trait-implementations-list"><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Clone-for-Arg"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#56">source</a><ahref="#impl-Clone-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html"title="trait core::clone::Clone">Clone</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.clone"class="method trait-impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#56">source</a><ahref="#method.clone"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#tymethod.clone"class="fn">clone</a>(&self) -><aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h4></section></summary><divclass='docblock'>Returns a copy of the value. <ahref="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.clone_from"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.0.0">1.0.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/clone.rs.html#169">source</a></span><ahref="#method.clone_from"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#method.clone_from"class="fn">clone_from</a>(&mut self, source: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&Self</a>)</h4></section></summary><divclass='docblock'>Performs copy-assignment from <code>source</code>. <ahref="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Debug-for-Arg"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4456">source</a><ahref="#impl-Debug-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.fmt"class="method trait-impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4457">source</a><ahref="#method.fmt"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt"class="fn">fmt</a>(&self, f: &mut <aclass="struct"href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html"title="struct core::fmt::Formatter">Formatter</a><'_>) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, <aclass="struct"href="https://doc.rust-la
Self: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><divclass='docblock'>Compares and returns the maximum of two values. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.Ord.html#method.max">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.min"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.21.0">1.21.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/cmp.rs.html#877-879">source</a></span><ahref="#method.min"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.Ord.html#method.min"class="fn">min</a>(self, other: Self) -> Self<divclass="where">where
Self: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><divclass='docblock'>Compares and returns the minimum of two values. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.Ord.html#method.min">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.clamp"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.50.0">1.50.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/cmp.rs.html#903-906">source</a></span><ahref="#method.clamp"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.Ord.html#method.clamp"class="fn">clamp</a>(self, min: Self, max: Self) -> Self<divclass="where">where
Self: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a> + <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html"title="trait core::cmp::PartialOrd">PartialOrd</a>,</div></h4></section></summary><divclass='docblock'>Restrict a value to a certain interval. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.Ord.html#method.clamp">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-PartialEq-for-Arg"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4429">source</a><ahref="#impl-PartialEq-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialEq.html"title="trait core::cmp::PartialEq">PartialEq</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.eq"class="method trait-impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4430">source</a><ahref="#method.eq"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialEq.html#tymethod.eq"class="fn">eq</a>(&self, other: &<aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used
by <code>==</code>.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.ne"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.0.0">1.0.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/cmp.rs.html#263">source</a></span><ahref="#method.ne"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialEq.html#method.ne"class="fn">ne</a>(&self, other: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&Rhs</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests for <code>!=</code>. The default implementation is almost always
sufficient, and should not be overridden without very good reason.</div></details></div></details><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-PartialOrd-for-Arg"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4435">source</a><ahref="#impl-PartialOrd-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html"title="trait core::cmp::PartialOrd">PartialOrd</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.partial_cmp"class="method trait-impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4436">source</a><ahref="#method.partial_cmp"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#tymethod.partial_cmp"class="fn">partial_cmp</a>(&self, other: &<aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a>) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/cmp/enum.Ordering.html"title="enum core::cmp::Ordering">Ordering</a>></h4></section></summary><divclass='docblock'>This method returns an ordering between <code>self</code> and <code>other</code> values if one exists. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#tymethod.partial_cmp">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.lt"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.0.0">1.0.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/cmp.rs.html#1180">source</a></span><ahref="#method.lt"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.lt"class="fn">lt</a>(&self, other: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&Rhs</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests less than (for <code>self</code> and <code>other</code>) and is used by the <code><</code> operator. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.lt">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.le"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.0.0">1.0.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/cmp.rs.html#1198">source</a></span><ahref="#method.le"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.le"class="fn">le</a>(&self, other: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&Rhs</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests less than or equal to (for <code>self</code> and <code>other</code>) and is used by the <code><=</code>
operator. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.le">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.gt"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.0.0">1.0.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/cmp.rs.html#1215">source</a></span><ahref="#method.gt"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.gt"class="fn">gt</a>(&self, other: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&Rhs</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests greater than (for <code>self</code> and <code>other</code>) and is used by the <code>></code> operator. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.gt">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.ge"class="method trait-impl"><spanclass="rightside"><spanclass="since"title="Stable since Rust version 1.0.0">1.0.0</span> · <aclass="src"href="https://doc.rust-lang.org/1.80.0/src/core/cmp.rs.html#1233">source</a></span><ahref="#method.ge"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.ge"class="fn">ge</a>(&self, other: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&Rhs</a>) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><divclass='docblock'>This method tests greater than or equal to (for <code>self</code> and <code>other</code>) and is used by the <code>>=</code>
operator. <ahref="https://doc.rust-lang.org/1.80.0/core/cmp/trait.PartialOrd.html#method.ge">Read more</a></div></details></div></details><sectionid="impl-Eq-for-Arg"class="impl"><aclass="src rightside"href="../src/clap_builder/builder/arg.rs.html#4447">source</a><ahref="#impl-Eq-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/cmp/trait.Eq.html"title="trait core::cmp::Eq">Eq</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></div><h2id="synthetic-implementations"class="section-header">Auto Trait Implementations<ahref="#synthetic-implementations"class="anchor">§</a></h2><divid="synthetic-implementations-list"><sectionid="impl-Freeze-for-Arg"class="impl"><ahref="#impl-Freeze-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Freeze.html"title="trait core::marker::Freeze">Freeze</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section><sectionid="impl-RefUnwindSafe-for-Arg"class="impl"><ahref="#impl-RefUnwindSafe-for-Arg"class="anchor">§</a><h3class="code-header">impl !<aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html"title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section><sectionid="impl-Send-for-Arg"class="impl"><ahref="#impl-Send-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section><sectionid="impl-Sync-for-Arg"class="impl"><ahref="#impl-Sync-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section><sectionid="impl-Unpin-for-Arg"class="impl"><ahref="#impl-Unpin-for-Arg"class="anchor">§</a><h3class="code-header">impl <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html"title="trait core::marker::Unpin">Unpin</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section><sectionid="impl-UnwindSafe-for-Arg"class="impl"><ahref="#impl-UnwindSafe-for-Arg"class="anchor">§</a><h3class="code-header">impl !<aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.UnwindSafe.html"title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <aclass="struct"href="struct.Arg.html"title="struct clap::Arg">Arg</a></h3></section></div><h2id="blanket-implementations"class="section-header">Blanket Implementations<ahref="#blanket-implementations"class="anchor">§</a></h2><divid="blanket-implementations-list"><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-Any-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/any.rs.html#140">source</a><ahref="#impl-Any-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html"title="trait core::any::Any">Any</a> for T<divclass="where">where
T: 'static + ?<aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.type_id"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/any.rs.html#141">source</a><ahref="#method.type_id"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html#tymethod.type_id"class="fn">type_id</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/1.80.0/core/any/struct.TypeId.html"title="struct core::any::TypeId">TypeId</a></h4></section></summary><divclass='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <ahref="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-Borrow%3CT%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#208">source</a><ahref="#impl-Borrow%3CT%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html"title="trait core::borrow::Borrow">Borrow</a><T> for T<divclass="where">where
T: ?<aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.borrow"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#210">source</a><ahref="#method.borrow"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow"class="fn">borrow</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&T</a></h4></section></summary><divclass='docblock'>Immutably borrows from an owned value. <ahref="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-BorrowMut%3CT%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#216">source</a><ahref="#impl-BorrowMut%3CT%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html"title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<divclass="where">where
T: ?<aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.borrow_mut"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#217">source</a><ahref="#method.borrow_mut"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut"class="fn">borrow_mut</a>(&mut self) -><aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&mut T</a></h4></section></summary><divclass='docblock'>Mutably borrows from an owned value. <ahref="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-From%3CT%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#765">source</a><ahref="#impl-From%3CT%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for T</h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.from-1"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#768">source</a><ahref="#method.from-1"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from"class="fn">from</a>(t: T) -> T</h4></section></summary><divclass="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-Into%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#748-750">source</a><ahref="#impl-Into%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><U> for T<divclass="where">where
<code><ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-ToOwned-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/alloc/borrow.rs.html#83-85">source</a><ahref="#impl-ToOwned-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html"title="trait alloc::borrow::ToOwned">ToOwned</a> for T<divclass="where">where
T: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html"title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Owned"class="associatedtype trait-impl"><ahref="#associatedtype.Owned"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned"class="associatedtype">Owned</a> = T</h4></section></summary><divclass='docblock'>The resulting type after obtaining ownership.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.to_owned"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/alloc/borrow.rs.html#88">source</a><ahref="#method.to_owned"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned"class="fn">to_owned</a>(&self) -> T</h4></section></summary><divclass='docblock'>Creates owned data from borrowed data, usually by cloning. <ahref="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.clone_into"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/alloc/borrow.rs.html#92">source</a><ahref="#method.clone_into"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#method.clone_into"class="fn">clone_into</a>(&self, target: <aclass="primitive"href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&mut T</a>)</h4></section></summary><divclass='docblock'>Uses borrowed data to replace owned data, usually by cloning. <ahref="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-ToString-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/alloc/string.rs.html#2552">source</a><ahref="#impl-ToString-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.80.0/alloc/string/trait.ToString.html"title="trait alloc::string::ToString">ToString</a> for T<divclass="where">where
T: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Display.html"title="trait core::fmt::Display">Display</a> + ?<aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.to_string"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/alloc/string.rs.html#2558">source</a><ahref="#method.to_string"class="anchor">§</a><h4class="code-header">default fn <ahref="https://doc.rust-lang.org/1.80.0/alloc/string/trait.ToString.html#tymethod.to_string"class="fn">to_string</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/1.80.0/alloc/string/struct.String.html"title="struct alloc::string::String">String</a></h4></section></summary><divclass='docblock'>Converts the given value to a <code>String</code>. <ahref="https://doc.rust-lang.org/1.80.0/alloc/string/trait.ToString.html#tymethod.to_string">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryFrom%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#805-807">source</a><ahref="#impl-TryFrom%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error"class="associatedtype trait-impl"><ahref="#associatedtype.Error"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error"class="associatedtype">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></h4></section></summary><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_from"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#812">source</a><ahref="#method.try_from"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#tymethod.try_from"class="fn">try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><divclass='docblock'>Performs the conversion.</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryInto%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#790-792">source</a><ahref="#impl-TryInto%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error-1"class="associatedtype trait-impl"><ahref="#associatedtype.Error-1"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#associatedtype.Error"class="associatedtype">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_into"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#797">source</a><ahref="#method.try_into"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#tymethod.try_into"class="fn">try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><divclass='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>
