| <!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="Source of the Rust file `crates/stdx/src/macros.rs`."><title>macros.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.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-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-84e720fa.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="stdx" data-themes="" data-resource-suffix="" data-rustdoc-version="1.89.0 (29483883e 2025-08-04)" data-channel="1.89.0" data-search-js="search-92309212.js" data-settings-js="settings-5514c975.js" ><script src="../../static.files/storage-4e99c027.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-fd3af306.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">stdx/</div>macros.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-2"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! Convenience macros. |
| <a href=#2 id=2 data-nosnippet>2</a> |
| <a href=#3 id=3 data-nosnippet>3</a>/// Appends formatted string to a `String`. |
| <a href=#4 id=4 data-nosnippet>4</a></span><span class="attr">#[macro_export] |
| <a href=#5 id=5 data-nosnippet>5</a></span><span class="macro">macro_rules!</span> format_to { |
| <a href=#6 id=6 data-nosnippet>6</a> (<span class="macro-nonterminal">$buf</span>:expr) => (); |
| <a href=#7 id=7 data-nosnippet>7</a> (<span class="macro-nonterminal">$buf</span>:expr, <span class="macro-nonterminal">$lit</span>:literal $(<span class="macro-nonterminal">$arg</span>:tt)<span class="kw-2">*</span>) => { |
| <a href=#8 id=8 data-nosnippet>8</a> { |
| <a href=#9 id=9 data-nosnippet>9</a> <span class="kw">use </span>::std::fmt::Write <span class="kw">as _</span>; |
| <a href=#10 id=10 data-nosnippet>10</a> <span class="comment">// We can't do ::std::fmt::Write::write_fmt($buf, format_args!($lit $($arg)*)) |
| <a href=#11 id=11 data-nosnippet>11</a> // unfortunately, as that loses out on autoref behavior. |
| <a href=#12 id=12 data-nosnippet>12</a> </span><span class="kw">_ </span>= <span class="macro-nonterminal">$buf</span>.write_fmt(<span class="macro">format_args!</span>(<span class="macro-nonterminal">$lit </span>$(<span class="macro-nonterminal">$arg</span>)<span class="kw-2">*</span>)) |
| <a href=#13 id=13 data-nosnippet>13</a> } |
| <a href=#14 id=14 data-nosnippet>14</a> }; |
| <a href=#15 id=15 data-nosnippet>15</a>} |
| <a href=#16 id=16 data-nosnippet>16</a> |
| <a href=#17 id=17 data-nosnippet>17</a><span class="doccomment">/// Appends formatted string to a `String` and returns the `String`. |
| <a href=#18 id=18 data-nosnippet>18</a>/// |
| <a href=#19 id=19 data-nosnippet>19</a>/// Useful for folding iterators into a `String`. |
| <a href=#20 id=20 data-nosnippet>20</a></span><span class="attr">#[macro_export] |
| <a href=#21 id=21 data-nosnippet>21</a></span><span class="macro">macro_rules!</span> format_to_acc { |
| <a href=#22 id=22 data-nosnippet>22</a> (<span class="macro-nonterminal">$buf</span>:expr, <span class="macro-nonterminal">$lit</span>:literal $(<span class="macro-nonterminal">$arg</span>:tt)<span class="kw-2">*</span>) => { |
| <a href=#23 id=23 data-nosnippet>23</a> { |
| <a href=#24 id=24 data-nosnippet>24</a> <span class="kw">use </span>::std::fmt::Write <span class="kw">as _</span>; |
| <a href=#25 id=25 data-nosnippet>25</a> <span class="comment">// We can't do ::std::fmt::Write::write_fmt($buf, format_args!($lit $($arg)*)) |
| <a href=#26 id=26 data-nosnippet>26</a> // unfortunately, as that loses out on autoref behavior. |
| <a href=#27 id=27 data-nosnippet>27</a> </span><span class="kw">_ </span>= <span class="macro-nonterminal">$buf</span>.write_fmt(<span class="macro">format_args!</span>(<span class="macro-nonterminal">$lit </span>$(<span class="macro-nonterminal">$arg</span>)<span class="kw-2">*</span>)); |
| <a href=#28 id=28 data-nosnippet>28</a> <span class="macro-nonterminal">$buf |
| <a href=#29 id=29 data-nosnippet>29</a> </span>} |
| <a href=#30 id=30 data-nosnippet>30</a> }; |
| <a href=#31 id=31 data-nosnippet>31</a>} |
| <a href=#32 id=32 data-nosnippet>32</a> |
| <a href=#33 id=33 data-nosnippet>33</a><span class="doccomment">/// Generates `From` impls for `Enum E { Foo(Foo), Bar(Bar) }` enums |
| <a href=#34 id=34 data-nosnippet>34</a>/// |
| <a href=#35 id=35 data-nosnippet>35</a>/// # Example |
| <a href=#36 id=36 data-nosnippet>36</a>/// |
| <a href=#37 id=37 data-nosnippet>37</a>/// ```ignore |
| <a href=#38 id=38 data-nosnippet>38</a>/// impl_from!(Struct, Union, Enum for Adt); |
| <a href=#39 id=39 data-nosnippet>39</a>/// ``` |
| <a href=#40 id=40 data-nosnippet>40</a></span><span class="attr">#[macro_export] |
| <a href=#41 id=41 data-nosnippet>41</a></span><span class="macro">macro_rules!</span> impl_from { |
| <a href=#42 id=42 data-nosnippet>42</a> ($(<span class="macro-nonterminal">$variant</span>:ident $(($(<span class="macro-nonterminal">$sub_variant</span>:ident),<span class="kw-2">*</span>))<span class="question-mark">?</span>),* <span class="kw">for </span><span class="macro-nonterminal">$</span><span class="kw">enum</span>:<span class="macro-nonterminal">ident</span>) => { |
| <a href=#43 id=43 data-nosnippet>43</a> $( |
| <a href=#44 id=44 data-nosnippet>44</a> <span class="kw">impl </span>From<<span class="macro-nonterminal">$variant</span>> <span class="kw">for </span><span class="macro-nonterminal">$</span><span class="kw">enum </span>{ |
| <a href=#45 id=45 data-nosnippet>45</a> <span class="kw">fn </span><span class="macro-nonterminal">from</span>(it: <span class="macro-nonterminal">$variant</span>) -> <span class="macro-nonterminal">$</span><span class="kw">enum </span>{ |
| <a href=#46 id=46 data-nosnippet>46</a> <span class="macro-nonterminal">$</span><span class="kw">enum</span>::<span class="macro-nonterminal">$variant</span>(it) |
| <a href=#47 id=47 data-nosnippet>47</a> } |
| <a href=#48 id=48 data-nosnippet>48</a> } |
| <a href=#49 id=49 data-nosnippet>49</a> $($( |
| <a href=#50 id=50 data-nosnippet>50</a> <span class="kw">impl </span>From<<span class="macro-nonterminal">$sub_variant</span>> <span class="kw">for </span><span class="macro-nonterminal">$</span><span class="kw">enum </span>{ |
| <a href=#51 id=51 data-nosnippet>51</a> <span class="kw">fn </span><span class="macro-nonterminal">from</span>(it: <span class="macro-nonterminal">$sub_variant</span>) -> <span class="macro-nonterminal">$</span><span class="kw">enum </span>{ |
| <a href=#52 id=52 data-nosnippet>52</a> <span class="macro-nonterminal">$</span><span class="kw">enum</span>::<span class="macro-nonterminal">$variant</span>(<span class="macro-nonterminal">$variant</span>::<span class="macro-nonterminal">$sub_variant</span>(it)) |
| <a href=#53 id=53 data-nosnippet>53</a> } |
| <a href=#54 id=54 data-nosnippet>54</a> } |
| <a href=#55 id=55 data-nosnippet>55</a> )<span class="kw-2">*</span>)<span class="question-mark">? |
| <a href=#56 id=56 data-nosnippet>56</a> </span>)* |
| <a href=#57 id=57 data-nosnippet>57</a> }; |
| <a href=#58 id=58 data-nosnippet>58</a> ($(<span class="macro-nonterminal">$variant</span>:ident$(<<span class="macro-nonterminal">$V</span>:ident>)<span class="question-mark">?</span>),* <span class="kw">for </span><span class="macro-nonterminal">$</span><span class="kw">enum</span>:<span class="macro-nonterminal">ident</span>) => { |
| <a href=#59 id=59 data-nosnippet>59</a> $( |
| <a href=#60 id=60 data-nosnippet>60</a> <span class="kw">impl</span>$(<<span class="macro-nonterminal">$V</span>>)<span class="question-mark">? </span>From<<span class="macro-nonterminal">$variant</span>$(<<span class="macro-nonterminal">$V</span>>)<span class="question-mark">?</span>> <span class="kw">for </span><span class="macro-nonterminal">$</span><span class="kw">enum</span>$(<<span class="macro-nonterminal">$V</span>>)<span class="question-mark">? </span>{ |
| <a href=#61 id=61 data-nosnippet>61</a> <span class="kw">fn </span>from(it: <span class="macro-nonterminal">$variant</span>$(<<span class="macro-nonterminal">$V</span>>)<span class="question-mark">?</span>) -> <span class="macro-nonterminal">$</span><span class="kw">enum</span>$(<<span class="macro-nonterminal">$V</span>>)<span class="question-mark">? </span>{ |
| <a href=#62 id=62 data-nosnippet>62</a> <span class="macro-nonterminal">$</span><span class="kw">enum</span>::<span class="macro-nonterminal">$variant</span>(it) |
| <a href=#63 id=63 data-nosnippet>63</a> } |
| <a href=#64 id=64 data-nosnippet>64</a> } |
| <a href=#65 id=65 data-nosnippet>65</a> )* |
| <a href=#66 id=66 data-nosnippet>66</a> } |
| <a href=#67 id=67 data-nosnippet>67</a>}</code></pre></div></section></main></body></html> |
