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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="Helper macro that allows deriving various typeclass instances from other traits or typeclasses."><title>deriving in naan - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.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/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="naan" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../naan/index.html">naan</a><span class="version">0.1.32</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">naan</a></span><h1>Macro <span class="macro">deriving</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/naan/lib.rs.html#829-986">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! deriving {
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(impl$(<$($vars:ident),+>)? Functor<$hkt:ty, $a:ident> for $t:ty {..FunctorOnce}) => { ... };
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(impl$(<$($vars:ident),+>)? Bifunctor<$hkt:ty, $a:ident, $b:ident> for $t:ty {..BifunctorOnce}) => { ... };
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(impl$(<$($vars:ident),+>)? Apply<$hkt:ty, $ab:ident> for $t:ty {..ApplyOnce}) => { ... };
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(impl$(<$($vars:ident),+>)? Plus<$hkt:ty, $a:ident> for $t:ty {..Default}) => { ... };
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(impl$(<$($vars:ident),+>)? Semigroup for $t:ty {..Alt}) => { ... };
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(impl$(<$($vars:ident),+>)? Monoid for $t:ty {..Default}) => { ... };
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(impl$(<$($vars:ident),+>)? FoldableIndexed<$hkt:ty, $idx:ident, $a:ident> for $t:ty {..FoldableOnceIndexed}) => { ... };
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(impl$(<$($vars:ident),+>)? FoldableOnce<$hkt:ty, $a:ident> for $t:ty {..FoldableOnceIndexed}) => { ... };
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(impl$(<$($vars:ident),+>)? Foldable<$hkt:ty, $a:ident> for $t:ty {..FoldableOnce}) => { ... };
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(impl$(<$($vars:ident),+>)? Foldable<$hkt:ty, $a:ident> for $t:ty {..FoldableIndexed}) => { ... };
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(impl$(<$($vars:ident),+>)? Traversable<$hkt:ty, $a:ident, $b:ident, $tf:ty> for $t:ty {..TraversableOnce}) => { ... };
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(impl$(<$($vars:ident),+>)? Monad<$hkt:ty, $a:ident> for $t:ty {..MonadOnce}) => { ... };
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Helper macro that allows deriving various typeclass instances from
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other traits or typeclasses.</p>
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<p>e.g. Functor can use the implementation for FunctorOnce, Plus can use Default.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>naan::prelude::<span class="kw-2">*</span>;
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<span class="attr">#[derive(Default)]
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</span><span class="kw">pub struct </span>Foo(String);
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<span class="kw">impl </span>Semigroup <span class="kw">for </span>Foo {
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<span class="kw">fn </span>append(<span class="self">self</span>, other: <span class="self">Self</span>) -> <span class="self">Self </span>{
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Foo(<span class="self">self</span>.<span class="number">0</span>.append(other.<span class="number">0</span>))
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}
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}
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<span class="macro">deriving!</span>(<span class="kw">impl </span>Monoid <span class="kw">for </span>Foo {..Default});</code></pre></div>
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</div></details></section></div></main></body></html> |