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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><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><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-b0742ba02757f159.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="1.83.0 (90b35a623 2024-11-26)" data-channel="1.83.0" data-search-js="search-f0d225181b97f9a4.js" data-settings-js="settings-805db61a62df4bd2.js" ><script src="../static.files/storage-1d39b6787ed640ff.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-f070b9041d14864c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-0111fcff984fae8f.css"></noscript><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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../quote/index.html">quote</a><span class="version">1.0.37</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">ToTokens</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.to_tokens" title="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" title="into_token_stream">into_token_stream</a></li><li><a href="#method.to_token_stream" title="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" title="&#38;&#39;a T">&#38;&#39;a T</a></li><li><a href="#impl-ToTokens-for-%26mut+T" title="&#38;&#39;a mut T">&#38;&#39;a mut T</a></li><li><a href="#impl-ToTokens-for-Box%3CT%3E" title="Box&#60;T&#62;">Box&#60;T&#62;</a></li><li><a href="#impl-ToTokens-for-CStr" title="CStr">CStr</a></li><li><a href="#impl-ToTokens-for-CString" title="CString">CString</a></li><li><a href="#impl-ToTokens-for-Cow%3C'a,+T%3E" title="Cow&#60;&#39;a, T&#62;">Cow&#60;&#39;a, T&#62;</a></li><li><a href="#impl-ToTokens-for-Group" title="Group">Group</a></li><li><a href="#impl-ToTokens-for-Ident" title="Ident">Ident</a></li><li><a href="#impl-ToTokens-for-Literal" title="Literal">Literal</a></li><li><a href="#impl-ToTokens-for-Option%3CT%3E" title="Option&#60;T&#62;">Option&#60;T&#62;</a></li><li><a href="#impl-ToTokens-for-Punct" title="Punct">Punct</a></li><li><a href="#impl-ToTokens-for-Rc%3CT%3E" title="Rc&#60;T&#62;">Rc&#60;T&#62;</a></li><li><a href="#impl-ToTokens-for-String" title="String">String</a></li><li><a href="#impl-ToTokens-for-TokenStream" title="TokenStream">TokenStream</a></li><li><a href="#impl-ToTokens-for-TokenTree" title="TokenTree">TokenTree</a></li><li><a href="#impl-ToTokens-for-bool" title="bool">bool</a></li><li><a href="#impl-ToTokens-for-char" title="char">char</a></li><li><a href="#impl-ToTokens-for-f32" title="f32">f32</a></li
// Required method
fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&amp;self, tokens: &amp;mut <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>);
// Provided methods
fn <a href="#method.to_token_stream" class="fn">to_token_stream</a>(&amp;self) -&gt; <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a> { ... }
<span class="item-spacer"></span> fn <a href="#method.into_token_stream" class="fn">into_token_stream</a>(self) -&gt; <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a>
<span class="where">where Self: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span> { ... }
}</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>
</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#54">source</a><h4 class="code-header">fn <a href="#tymethod.to_tokens" class="fn">to_tokens</a>(&amp;self, tokens: &amp;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>
<p>The token append methods provided by the <a href="trait.TokenStreamExt.html"><code>TokenStreamExt</code></a> extension
trait may be useful for implementing <code>ToTokens</code>.</p>
<h5 id="example"><a class="doc-anchor" href="#example">§</a>Example</h5>
<p>Example implementation for a struct representing Rust paths like
<code>std::cmp::PartialEq</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>proc_macro2::{TokenTree, Spacing, Span, Punct, TokenStream};
<span class="kw">use </span>quote::{TokenStreamExt, ToTokens};
<span class="kw">pub struct </span>Path {
<span class="kw">pub </span>global: bool,
<span class="kw">pub </span>segments: Vec&lt;PathSegment&gt;,
}
<span class="kw">impl </span>ToTokens <span class="kw">for </span>Path {
<span class="kw">fn </span>to_tokens(<span class="kw-2">&amp;</span><span class="self">self</span>, tokens: <span class="kw-2">&amp;mut </span>TokenStream) {
<span class="kw">for </span>(i, segment) <span class="kw">in </span><span class="self">self</span>.segments.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>|| <span class="self">self</span>.global {
<span class="comment">// Double colon `::`
</span>tokens.append(Punct::new(<span class="string">':'</span>, Spacing::Joint));
tokens.append(Punct::new(<span class="string">':'</span>, Spacing::Alone));
}
segment.to_tokens(tokens);
}
}
}</code></pre></div>
</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#60-64">source</a><h4 class="code-header">fn <a href="#method.to_token_stream" class="fn">to_token_stream</a>(&amp;self) -&gt; <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>
<p>This method is implicitly implemented using <code>to_tokens</code>, and acts as a
convenience method for consumers of the <code>ToTokens</code> trait.</p>
</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#70-75">source</a><h4 class="code-header">fn <a href="#method.into_token_stream" class="fn">into_token_stream</a>(self) -&gt; <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a><div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.83.0/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>
<p>This method is implicitly implemented using <code>to_tokens</code>, and acts as a
convenience method for consumers of the <code>ToTokens</code> trait.</p>
</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#261-265">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#262-264">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>(&amp;self, tokens: &amp;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#218-223">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/1.83.0/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#219-222">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>(&amp;self, tokens: &amp;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#212-216">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/1.83.0/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#213-215">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>(&amp;self, tokens: &amp;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#200-204">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/1.83.0/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#201-203">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>(&amp;self, tokens: &amp;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