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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Types that can be interpolated inside a `quote!` invocation."><title>ToTokens in quote - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="quote" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../quote/index.html">quote</a><span class="version">1.0.35</span></h2></div><h2 class="location"><a href="#">ToTokens</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.to_tokens">to_tokens</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.into_token_stream">into_token_stream</a></li><li><a href="#method.to_token_stream">to_token_stream</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-ToTokens-for-%26T">&'a T</a></li><li><a href="#impl-ToTokens-for-%26mut+T">&'a mut T</a></li><li><a href="#impl-ToTokens-for-Box%3CT%3E">Box<T></a></li><li><a href="#impl-ToTokens-for-Cow%3C'a,+T%3E">Cow<'a, T></a></li><li><a href="#impl-ToTokens-for-Group">Group</a></li><li><a href="#impl-ToTokens-for-Ident">Ident</a></li><li><a href="#impl-ToTokens-for-Literal">Literal</a></li><li><a href="#impl-ToTokens-for-Option%3CT%3E">Option<T></a></li><li><a href="#impl-ToTokens-for-Punct">Punct</a></li><li><a href="#impl-ToTokens-for-Rc%3CT%3E">Rc<T></a></li><li><a href="#impl-ToTokens-for-String">String</a></li><li><a href="#impl-ToTokens-for-TokenStream">TokenStream</a></li><li><a href="#impl-ToTokens-for-TokenTree">TokenTree</a></li><li><a href="#impl-ToTokens-for-bool">bool</a></li><li><a href="#impl-ToTokens-for-char">char</a></li><li><a href="#impl-ToTokens-for-f32">f32</a></li><li><a href="#impl-ToTokens-for-f64">f64</a></li><li><a href="#impl-ToTokens-for-i128">i128</a></li><li><a href="#impl-ToTokens-for-i16">i16</a></li><li><a href="#impl-ToTokens-for-i32">i32</a></li><li><a href="#impl-ToTokens-for-i64">i64</a><
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../quote/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="index.html">quote</a>::<wbr><a class="trait" href="#">ToTokens</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/quote/to_tokens.rs.html#10-75">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait ToTokens {
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// Required method
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fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>);
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// Provided methods
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fn <a href="#method.to_token_stream" class="fn">to_token_stream</a>(&self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a> { ... }
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<span class="item-spacer"></span> fn <a href="#method.into_token_stream" class="fn">into_token_stream</a>(self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>
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<span class="where">where Self: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span> { ... }
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Types that can be interpolated inside a <code>quote!</code> invocation.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.to_tokens" class="method"><a class="src rightside" href="../src/quote/to_tokens.rs.html#53">source</a><h4 class="code-header">fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</h4></section></summary><div class="docblock"><p>Write <code>self</code> to the given <code>TokenStream</code>.</p>
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<p>The token append methods provided by the <a href="trait.TokenStreamExt.html"><code>TokenStreamExt</code></a> extension
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trait may be useful for implementing <code>ToTokens</code>.</p>
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<h5 id="example"><a href="#example">Example</a></h5>
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<p>Example implementation for a struct representing Rust paths like
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<code>std::cmp::PartialEq</code>:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>proc_macro2::{TokenTree, Spacing, Span, Punct, TokenStream};
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<span class="kw">use </span>quote::{TokenStreamExt, ToTokens};
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<span class="kw">pub struct </span>Path {
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<span class="kw">pub </span>global: bool,
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<span class="kw">pub </span>segments: Vec<PathSegment>,
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}
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<span class="kw">impl </span>ToTokens <span class="kw">for </span>Path {
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<span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) {
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<span class="kw">for </span>(i, segment) <span class="kw">in </span><span class="self">self</span>.segments.iter().enumerate() {
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<span class="kw">if </span>i > <span class="number">0 </span>|| <span class="self">self</span>.global {
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<span class="comment">// Double colon `::`
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</span>tokens.append(Punct::new(<span class="string">':'</span>, Spacing::Joint));
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tokens.append(Punct::new(<span class="string">':'</span>, Spacing::Alone));
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}
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segment.to_tokens(tokens);
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}
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}
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}</code></pre></div>
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</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.to_token_stream" class="method"><a class="src rightside" href="../src/quote/to_tokens.rs.html#59-63">source</a><h4 class="code-header">fn <a href="#method.to_token_stream" class="fn">to_token_stream</a>(&self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a></h4></section></summary><div class="docblock"><p>Convert <code>self</code> directly into a <code>TokenStream</code> object.</p>
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<p>This method is implicitly implemented using <code>to_tokens</code>, and acts as a
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convenience method for consumers of the <code>ToTokens</code> trait.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.into_token_stream" class="method"><a class="src rightside" href="../src/quote/to_tokens.rs.html#69-74">source</a><h4 class="code-header">fn <a href="#method.into_token_stream" class="fn">into_token_stream</a>(self) -> <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a><div class="where">where
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Self: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Convert <code>self</code> directly into a <code>TokenStream</code> object.</p>
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<p>This method is implicitly implemented using <code>to_tokens</code>, and acts as a
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convenience method for consumers of the <code>ToTokens</code> trait.</p>
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</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-ToTokens-for-TokenTree" class="impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#195-199">source</a><a href="#impl-ToTokens-for-TokenTree" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a> for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></h3></section></summary><div class="impl-items"><section id="method.to_tokens" class="method trait-impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#196-198">source</a><a href="#method.to_tokens" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&self, dst: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToTokens-for-bool" class="impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#164-169">source</a><a href="#impl-ToTokens-for-bool" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a> for <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h3></section></summary><div class="impl-items"><section id="method.to_tokens-1" class="method trait-impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#165-168">source</a><a href="#method.to_tokens-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToTokens-for-char" class="impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#158-162">source</a><a href="#impl-ToTokens-for-char" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a> for <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.char.html">char</a></h3></section></summary><div class="impl-items"><section id="method.to_tokens-2" class="method trait-impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#159-161">source</a><a href="#method.to_tokens-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToTokens-for-f32" class="impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#139-156">source</a><a href="#impl-ToTokens-for-f32" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ToTokens.html" title="trait quote::ToTokens">ToTokens</a> for <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.f32.html">f32</a></h3></section></summary><div class="impl-items"><section id="method.to_tokens-3" class="method trait-impl"><a class="src rightside" href="../src/quote/to_tokens.rs.html#139-156">source</a><a href="#method.to_tokens-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&self, tokens: &mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToTokens-for-f64" class="impl"><a class="src rig
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