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<p class='location'>Struct VariantInfo</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#fields">Fields</a><div class="sidebar-links"><a href="#structfield.prefix">prefix</a></div><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.bindings">bindings</a><a href="#method.bindings_mut">bindings_mut</a><a href="#method.ast">ast</a><a href="#method.omitted_bindings">omitted_bindings</a><a href="#method.pat">pat</a><a href="#method.construct">construct</a><a href="#method.each">each</a><a href="#method.fold">fold</a><a href="#method.filter">filter</a><a href="#method.remove_binding">remove_binding</a><a href="#method.bind_with">bind_with</a><a href="#method.binding_name">binding_name</a><a href="#method.referenced_ty_params">referenced_ty_params</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Clone">Clone</a><a href="#impl-PartialEq">PartialEq</a><a href="#impl-Eq">Eq</a><a href="#impl-Hash">Hash</a></div></div><p class='location'><a href='index.html'>synstructure</a></p><script>window.sidebarCurrent = {name: 'VariantInfo', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>synstructure</a>::<wbr><a class="struct" href=''>VariantInfo</a></span><span class='out-of-band'><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
</a>
</span><a class='srclink' href='../src/synstructure/lib.rs.html#324-330' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct VariantInfo<'a> {
pub prefix: <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a <a class="struct" href="../syn/ident/struct.Ident.html" title="struct syn::ident::Ident">Ident</a>>,
// some fields omitted
}</pre><div class='docblock'><p>A wrapper around a <code>syn</code> <code>DeriveInput</code>'s variant which provides utilities
for destructuring <code>Variant</code>s with <code>match</code> expressions.</p>
</div><h2 id='fields' class='fields small-section-header'>
Fields<a href='#fields' class='anchor'></a></h2><span id="structfield.prefix" class="structfield small-section-header">
<a href="#structfield.prefix" class="anchor field"></a>
<span id="prefix.v" class='invisible'>
<code>prefix: <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a <a class="struct" href="../syn/ident/struct.Ident.html" title="struct syn::ident::Ident">Ident</a>></code>
</span></span>
<h2 id='methods' class='small-section-header'>
Methods<a href='#methods' class='anchor'></a>
</h2>
<h3 id='impl' class='impl'><span class='in-band'><code>impl<'a> <a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#376-854' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.bindings' class="method"><span id='bindings.v' class='invisible'><code>pub fn <a href='#method.bindings' class='fnname'>bindings</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a><a class="struct" href="../synstructure/struct.BindingInfo.html" title="struct synstructure::BindingInfo">BindingInfo</a><'a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#405-407' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a slice of the bindings in this Variant.</p>
</div><h4 id='method.bindings_mut' class="method"><span id='bindings_mut.v' class='invisible'><code>pub fn <a href='#method.bindings_mut' class='fnname'>bindings_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</a><a class="struct" href="../synstructure/struct.BindingInfo.html" title="struct synstructure::BindingInfo">BindingInfo</a><'a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#410-412' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a mut slice of the bindings in this Variant.</p>
</div><h4 id='method.ast' class="method"><span id='ast.v' class='invisible'><code>pub fn <a href='#method.ast' class='fnname'>ast</a>(&self) -> <a class="struct" href="../synstructure/struct.VariantAst.html" title="struct synstructure::VariantAst">VariantAst</a><'a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#416-418' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a <code>VariantAst</code> object which contains references to the
underlying <code>syn</code> AST node which this <code>Variant</code> was created from.</p>
</div><h4 id='method.omitted_bindings' class="method"><span id='omitted_bindings.v' class='invisible'><code>pub fn <a href='#method.omitted_bindings' class='fnname'>omitted_bindings</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#421-423' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>True if any bindings were omitted due to a <code>filter</code> call.</p>
</div><h4 id='method.pat' class="method"><span id='pat.v' class='invisible'><code>pub fn <a href='#method.pat' class='fnname'>pat</a>(&self) -> <a class="struct" href="../quote/tokens/struct.Tokens.html" title="struct quote::tokens::Tokens">Tokens</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#450-487' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Generates the match-arm pattern which could be used to match against this Variant.</p>
<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
enum A {
B(i32, i32),
C(u32),
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">variants</span>()[<span class="number">0</span>].<span class="ident">pat</span>(),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">B</span>(<span class="kw-2">ref</span> <span class="ident">__binding_0</span>, <span class="kw-2">ref</span> <span class="ident">__binding_1</span>,)
}
);</pre>
</div><h4 id='method.construct' class="method"><span id='construct.v' class='invisible'><code>pub fn <a href='#method.construct' class='fnname'>construct</a><F, T>(&self, func: F) -> <a class="struct" href="../quote/tokens/struct.Tokens.html" title="struct quote::tokens::Tokens">Tokens</a> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../syn/data/struct.Field.html" title="struct syn::data::Field">Field</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> T,<br> T: <a class="trait" href="../quote/to_tokens/trait.ToTokens.html" title="trait quote::to_tokens::ToTokens">ToTokens</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#525-559' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Generates the token stream required to construct the current variant.</p>
<p>The init array initializes each of the fields in the order they are written in <code>variant.ast().fields</code>.</p>
<h1 id="example-1" class="section-header"><a href="#example-1">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
enum A {
B(usize, usize),
C{ v: usize },
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">variants</span>()[<span class="number">0</span>].<span class="ident">construct</span>(<span class="op">|</span>_, <span class="ident">i</span><span class="op">|</span> <span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">i</span>)),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">B</span>(<span class="number">0usize</span>, <span class="number">1usize</span>,)
}
);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">variants</span>()[<span class="number">1</span>].<span class="ident">construct</span>(<span class="op">|</span>_, <span class="ident">i</span><span class="op">|</span> <span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">i</span>)),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">C</span>{ <span class="ident">v</span>: <span class="number">0usize</span>, }
}
);</pre>
</div><h4 id='method.each' class="method"><span id='each.v' class='invisible'><code>pub fn <a href='#method.each' class='fnname'>each</a><F, R>(&self, f: F) -> <a class="struct" href="../quote/tokens/struct.Tokens.html" title="struct quote::tokens::Tokens">Tokens</a> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../synstructure/struct.BindingInfo.html" title="struct synstructure::BindingInfo">BindingInfo</a>) -> R,<br> R: <a class="trait" href="../quote/to_tokens/trait.ToTokens.html" title="trait quote::to_tokens::ToTokens">ToTokens</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#594-607' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Runs the passed-in function once for each bound field, passing in a <code>BindingInfo</code>.
and generating a <code>match</code> arm which evaluates the returned tokens.</p>
<p>This method will ignore fields which are ignored through the <code>filter</code>
method.</p>
<h1 id="example-2" class="section-header"><a href="#example-2">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
enum A {
B(i32, i32),
C(u32),
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">variants</span>()[<span class="number">0</span>].<span class="ident">each</span>(<span class="op">|</span><span class="ident">bi</span><span class="op">|</span> <span class="macro">quote</span><span class="macro">!</span>(<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, #<span class="ident">bi</span>))),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">B</span>(<span class="kw-2">ref</span> <span class="ident">__binding_0</span>, <span class="kw-2">ref</span> <span class="ident">__binding_1</span>,) <span class="op">=></span> {
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_0</span>) }
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_1</span>) }
}
}
);</pre>
</div><h4 id='method.fold' class="method"><span id='fold.v' class='invisible'><code>pub fn <a href='#method.fold' class='fnname'>fold</a><F, I, R>(&self, init: I, f: F) -> <a class="struct" href="../quote/tokens/struct.Tokens.html" title="struct quote::tokens::Tokens">Tokens</a> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="struct" href="../quote/tokens/struct.Tokens.html" title="struct quote::tokens::Tokens">Tokens</a>, &<a class="struct" href="../synstructure/struct.BindingInfo.html" title="struct synstructure::BindingInfo">BindingInfo</a>) -> R,<br> I: <a class="trait" href="../quote/to_tokens/trait.ToTokens.html" title="trait quote::to_tokens::ToTokens">ToTokens</a>,<br> R: <a class="trait" href="../quote/to_tokens/trait.ToTokens.html" title="trait quote::to_tokens::ToTokens">ToTokens</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#642-654' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Runs the passed-in function once for each bound field, passing in the
result of the previous call, and a <code>BindingInfo</code>. generating a <code>match</code>
arm which evaluates to the resulting tokens.</p>
<p>This method will ignore fields which are ignored through the <code>filter</code>
method.</p>
<h1 id="example-3" class="section-header"><a href="#example-3">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
enum A {
B(i32, i32),
C(u32),
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">variants</span>()[<span class="number">0</span>].<span class="ident">fold</span>(<span class="macro">quote</span><span class="macro">!</span>(<span class="number">0</span>), <span class="op">|</span><span class="ident">acc</span>, <span class="ident">bi</span><span class="op">|</span> <span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">acc</span> <span class="op">+</span> #<span class="ident">bi</span>)),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">B</span>(<span class="kw-2">ref</span> <span class="ident">__binding_0</span>, <span class="kw-2">ref</span> <span class="ident">__binding_1</span>,) <span class="op">=></span> {
<span class="number">0</span> <span class="op">+</span> <span class="ident">__binding_0</span> <span class="op">+</span> <span class="ident">__binding_1</span>
}
}
);</pre>
</div><h4 id='method.filter' class="method"><span id='filter.v' class='invisible'><code>pub fn <a href='#method.filter' class='fnname'>filter</a><F>(&mut self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../synstructure/struct.BindingInfo.html" title="struct synstructure::BindingInfo">BindingInfo</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#698-708' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Filter the bindings created by this <code>Variant</code> object. This has 2 effects:</p>
<ul>
<li>
<p>The bindings will no longer appear in match arms generated by methods
on this <code>Variant</code> or its subobjects.</p>
</li>
<li>
<p>Impl blocks created with the <code>bound_impl</code> or <code>unsafe_bound_impl</code>
method only consider type parameters referenced in the types of
non-filtered fields.</p>
</li>
</ul>
<h1 id="example-4" class="section-header"><a href="#example-4">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
enum A {
B{ a: i32, b: i32 },
C{ a: u32 },
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="ident">s</span>.<span class="ident">variants_mut</span>()[<span class="number">0</span>].<span class="ident">filter</span>(<span class="op">|</span><span class="ident">bi</span><span class="op">|</span> {
<span class="ident">bi</span>.<span class="ident">ast</span>().<span class="ident">ident</span> <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="string">"b"</span>.<span class="ident">into</span>())
});
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">each</span>(<span class="op">|</span><span class="ident">bi</span><span class="op">|</span> <span class="macro">quote</span><span class="macro">!</span>(<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, #<span class="ident">bi</span>))),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">B</span>{ <span class="ident">b</span>: <span class="kw-2">ref</span> <span class="ident">__binding_1</span>, .. } <span class="op">=></span> {
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_1</span>) }
}
<span class="ident">A</span>::<span class="ident">C</span>{ <span class="ident">a</span>: <span class="kw-2">ref</span> <span class="ident">__binding_0</span>, } <span class="op">=></span> {
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_0</span>) }
}
}
);</pre>
</div><h4 id='method.remove_binding' class="method"><span id='remove_binding.v' class='invisible'><code>pub fn <a href='#method.remove_binding' class='fnname'>remove_binding</a>(&mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#715-719' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Remove the binding at the given index.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>Panics if the index is out of range.</p>
</div><h4 id='method.bind_with' class="method"><span id='bind_with.v' class='invisible'><code>pub fn <a href='#method.bind_with' class='fnname'>bind_with</a><F>(&mut self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../synstructure/struct.BindingInfo.html" title="struct synstructure::BindingInfo">BindingInfo</a>) -> <a class="enum" href="../synstructure/enum.BindStyle.html" title="enum synstructure::BindStyle">BindStyle</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#756-764' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Updates the <code>BindStyle</code> for each of the passed-in fields by calling the
passed-in function for each <code>BindingInfo</code>.</p>
<h1 id="example-5" class="section-header"><a href="#example-5">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
enum A {
B(i32, i32),
C(u32),
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="ident">s</span>.<span class="ident">variants_mut</span>()[<span class="number">0</span>].<span class="ident">bind_with</span>(<span class="op">|</span><span class="ident">bi</span><span class="op">|</span> <span class="ident">BindStyle</span>::<span class="ident">RefMut</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">each</span>(<span class="op">|</span><span class="ident">bi</span><span class="op">|</span> <span class="macro">quote</span><span class="macro">!</span>(<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, #<span class="ident">bi</span>))),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">B</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">__binding_0</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">__binding_1</span>,) <span class="op">=></span> {
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_0</span>) }
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_1</span>) }
}
<span class="ident">A</span>::<span class="ident">C</span>(<span class="kw-2">ref</span> <span class="ident">__binding_0</span>,) <span class="op">=></span> {
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_0</span>) }
}
}
);</pre>
</div><h4 id='method.binding_name' class="method"><span id='binding_name.v' class='invisible'><code>pub fn <a href='#method.binding_name' class='fnname'>binding_name</a><F>(&mut self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../syn/data/struct.Field.html" title="struct syn::data::Field">Field</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="struct" href="../syn/ident/struct.Ident.html" title="struct syn::ident::Ident">Ident</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#807-815' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Updates the binding name for each fo the passed-in fields by calling the
passed-in function for each <code>BindingInfo</code>.</p>
<p>The function will be called with the <code>BindingInfo</code> and its index in the
enclosing variant.</p>
<p>The default name is <code>__binding_{}</code> where <code>{}</code> is replaced with an
increasing number.</p>
<h1 id="example-6" class="section-header"><a href="#example-6">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
enum A {
B{ a: i32, b: i32 },
C{ a: u32 },
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="ident">s</span>.<span class="ident">variants_mut</span>()[<span class="number">0</span>].<span class="ident">binding_name</span>(<span class="op">|</span><span class="ident">bi</span>, <span class="ident">i</span><span class="op">|</span> <span class="ident">bi</span>.<span class="ident">ident</span>.<span class="ident">clone</span>().<span class="ident">unwrap</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">each</span>(<span class="op">|</span><span class="ident">bi</span><span class="op">|</span> <span class="macro">quote</span><span class="macro">!</span>(<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, #<span class="ident">bi</span>))),
<span class="macro">quote</span><span class="macro">!</span>{
<span class="ident">A</span>::<span class="ident">B</span>{ <span class="ident">a</span>: <span class="kw-2">ref</span> <span class="ident">a</span>, <span class="ident">b</span>: <span class="kw-2">ref</span> <span class="ident">b</span>, } <span class="op">=></span> {
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">a</span>) }
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">b</span>) }
}
<span class="ident">A</span>::<span class="ident">C</span>{ <span class="ident">a</span>: <span class="kw-2">ref</span> <span class="ident">__binding_0</span>, } <span class="op">=></span> {
{ <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">__binding_0</span>) }
}
}
);</pre>
</div><h4 id='method.referenced_ty_params' class="method"><span id='referenced_ty_params.v' class='invisible'><code>pub fn <a href='#method.referenced_ty_params' class='fnname'>referenced_ty_params</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><&'a <a class="struct" href="../syn/ident/struct.Ident.html" title="struct syn::ident::Ident">Ident</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#847-853' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a list of the type parameters which are referenced in this
field's type.</p>
<h1 id="caveat" class="section-header"><a href="#caveat">Caveat</a></h1>
<p>If the field contains any macros in type position, all parameters will
be considered bound. This is because we cannot determine which type
parameters are bound by type macros.</p>
<h1 id="example-7" class="section-header"><a href="#example-7">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">di</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_derive_input</span>(<span class="string">r#"
struct A<T, U> {
a: Option<T>,
b: U,
}
"#</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Structure</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">di</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">s</span>.<span class="ident">variants</span>()[<span class="number">0</span>].<span class="ident">bindings</span>()[<span class="number">0</span>].<span class="ident">referenced_ty_params</span>(),
<span class="kw-2">&</span>[<span class="kw-2">&</span>(<span class="ident">syn</span>::<span class="ident">Ident</span>::<span class="ident">from</span>(<span class="string">"T"</span>))]
);</pre>
</div></div>
<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
</h2>
<h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a></code><a href='#impl-Clone' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#112-114' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a></code><a href='#impl-PartialEq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, __arg_0: &<a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, __arg_0: &<a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 id='impl-Eq' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a></code><a href='#impl-Eq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 id='impl-Hash' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> for <a class="struct" href="../synstructure/struct.VariantInfo.html" title="struct synstructure::VariantInfo">VariantInfo</a><'a></code><a href='#impl-Hash' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.hash' class="method"><span id='hash.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a><__H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>>(&self, __arg_0: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>__H)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/synstructure/lib.rs.html#323' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Feeds this value into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash">Read more</a></p>
</div><h4 id='method.hash_slice' class="method"><span id='hash_slice.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice' class='fnname'>hash_slice</a><H>(data: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[Self]</a>, state: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>H) <span class="where fmt-newline">where<br> H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.3.0'>1.3.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/hash/mod.rs.html#202-208' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Feeds a slice of this type into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice">Read more</a></p>
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