<main><divclass="width-limiter"><navclass="sub"><formclass="search-form"><span></span><divid="sidebar-button"tabindex="-1"><ahref="../cfg_if/all.html"title="show sidebar"></a></div><inputclass="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"><divid="help-button"tabindex="-1"><ahref="../help.html"title="help">?</a></div><divid="settings-menu"tabindex="-1"><ahref="../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><sectionid="main-content"class="content"><divclass="main-heading"><h1>Crate <aclass="mod"href="#">cfg_if</a><buttonid="copy-path"title="Copy item path to clipboard"><imgsrc="../static.files/clipboard-7571035ce49a181d.svg"width="19"height="18"alt="Copy item path"></button></h1><spanclass="out-of-band"><aclass="src"href="../src/cfg_if/lib.rs.html#1-176">source</a> · <buttonid="toggle-all-docs"title="collapse all docs">[<span>−</span>]</button></span></div><detailsclass="toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>A macro for defining <code>#[cfg]</code> if-else statements.</p>
<p>The macro provided by this crate, <code>cfg_if</code>, is similar to the <code>if/elif</code> C
preprocessor macro by allowing definition of a cascade of <code>#[cfg]</code> cases,
emitting the implementation which matches first.</p>
<p>This allows you to conveniently provide a long list <code>#[cfg]</code>’d blocks of code
without having to rewrite each clause multiple times.</p>
</div></details><h2id="macros"class="section-header">Macros<ahref="#macros"class="anchor">§</a></h2><ulclass="item-table"><li><divclass="item-name"><aclass="macro"href="macro.cfg_if.html"title="macro cfg_if::cfg_if">cfg_if</a></div><divclass="desc docblock-short">The main macro provided by this crate. See crate documentation for more
