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<p class='location'>Trait Placer</p><div class="block items"><ul><li><a href="#associated-types">Associated Types</a></li><li><a href="#required-methods">Required Methods</a></li><li><a href="#implementors">Implementors</a></li></ul></div><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>ops</a></p><script>window.sidebarCurrent = {name: 'Placer', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>std</a>::<wbr><a href='index.html'>ops</a>::<wbr><a class="trait" href=''>Placer</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'>
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</span><a class='srclink' href='../../src/core/ops.rs.html#2854-2861' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'>pub trait Placer<Data> <span class="where fmt-newline">where<br> Data: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span>{
type <a href='#associatedtype.Place' class="type">Place</a>: <a class="trait" href="../../std/ops/trait.InPlace.html" title="trait std::ops::InPlace">InPlace</a><Data>;
fn <a href='#tymethod.make_place' class='fnname'>make_place</a>(self) -> Self::<a class="trait" href="../../std/ops/trait.Placer.html" title="trait std::ops::Placer">Place</a>;
}</pre><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>placement_new_protocol </code><a href="https://github.com/rust-lang/rust/issues/27779">#27779</a>)</div></div><div class='docblock'><p>Interface to implementations of <code>PLACE <- EXPR</code>.</p>
<p><code>PLACE <- EXPR</code> effectively desugars into:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">PLACE</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">place</span> <span class="op">=</span> <span class="ident">Placer</span>::<span class="ident">make_place</span>(<span class="ident">p</span>);
<span class="kw">let</span> <span class="ident">raw_place</span> <span class="op">=</span> <span class="ident">Place</span>::<span class="ident">pointer</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">place</span>);
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">EXPR</span>;
<span class="kw">unsafe</span> {
<span class="ident">std</span>::<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">raw_place</span>, <span class="ident">value</span>);
<span class="ident">InPlace</span>::<span class="ident">finalize</span>(<span class="ident">place</span>)
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=fn%20main()%20%7B%0Alet%20p%20%3D%20PLACE%3B%0Alet%20mut%20place%20%3D%20Placer%3A%3Amake_place(p)%3B%0Alet%20raw_place%20%3D%20Place%3A%3Apointer(%26mut%20place)%3B%0Alet%20value%20%3D%20EXPR%3B%0Aunsafe%20%7B%0A%20%20%20%20std%3A%3Aptr%3A%3Awrite(raw_place%2C%20value)%3B%0A%20%20%20%20InPlace%3A%3Afinalize(place)%0A%7D%0A%7D">Run</a></pre>
<p>The type of <code>PLACE <- EXPR</code> is derived from the type of <code>PLACE</code>;
if the type of <code>PLACE</code> is <code>P</code>, then the final type of the whole
expression is <code>P::Place::Owner</code> (see the <code>InPlace</code> and <code>Boxed</code>
traits).</p>
<p>Values for types implementing this trait usually are transient
intermediate values (e.g. the return value of <code>Vec::emplace_back</code>)
or <code>Copy</code>, since the <code>make_place</code> method takes <code>self</code> by value.</p>
</div>
<h2 id='associated-types'>Associated Types</h2>
<div class='methods'>
<h3 id='associatedtype.Place' class='method'><span id='Place.t' class='invisible'><code>type <a href='#associatedtype.Place' class="type">Place</a>: <a class="trait" href="../../std/ops/trait.InPlace.html" title="trait std::ops::InPlace">InPlace</a><Data></code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>placement_new_protocol </code><a href="https://github.com/rust-lang/rust/issues/27779">#27779</a>)</div></div><div class='docblock'><p><code>Place</code> is the intermedate agent guarding the
uninitialized state for <code>Data</code>.</p>
</div></div>
<h2 id='required-methods'>Required Methods</h2>
<div class='methods'>
<h3 id='tymethod.make_place' class='method'><span id='make_place.v' class='invisible'><code>fn <a href='#tymethod.make_place' class='fnname'>make_place</a>(self) -> Self::<a class="trait" href="../../std/ops/trait.Placer.html" title="trait std::ops::Placer">Place</a></code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>placement_new_protocol </code><a href="https://github.com/rust-lang/rust/issues/27779">#27779</a>)</div></div><div class='docblock'><p>Creates a fresh place from <code>self</code>.</p>
</div></div>
<h2 id='implementors'>Implementors</h2>
<ul class='item-list' id='implementors-list'>
<li><code>impl<'a, T> Placer<T> for <a class="struct" href="../../std/collections/linked_list/struct.FrontPlace.html" title="struct std::collections::linked_list::FrontPlace">FrontPlace</a><'a, T></code></li>
<li><code>impl<'a, T> Placer<T> for <a class="struct" href="../../std/collections/vec_deque/struct.PlaceFront.html" title="struct std::collections::vec_deque::PlaceFront">PlaceFront</a><'a, T></code></li>
<li><code>impl<'a, T> Placer<T> for std::vec::<a class="struct" href="../../std/vec/struct.PlaceBack.html" title="struct std::vec::PlaceBack">PlaceBack</a><'a, T></code></li>
<li><code>impl<'a, T> Placer<T> for <a class="struct" href="../../std/collections/linked_list/struct.BackPlace.html" title="struct std::collections::linked_list::BackPlace">BackPlace</a><'a, T></code></li>
<li><code>impl<'a, T> Placer<T> for std::collections::vec_deque::<a class="struct" href="../../std/collections/vec_deque/struct.PlaceBack.html" title="struct std::collections::vec_deque::PlaceBack">PlaceBack</a><'a, T></code></li>
<li><code>impl<'a, T> Placer<T> for &'a mut <a class="struct" href="../../std/collections/binary_heap/struct.BinaryHeap.html" title="struct std::collections::binary_heap::BinaryHeap">BinaryHeap</a><T> <span class="where fmt-newline">where<br> T: 'a + <a class="trait" href="../../std/clone/trait.Clone.html" title="trait std::clone::Clone">Clone</a> + <a class="trait" href="../../std/cmp/trait.Ord.html" title="trait std::cmp::Ord">Ord</a>, </span></code></li>
<li><code>impl<T> Placer<T> for <a class="struct" href="../../std/boxed/struct.ExchangeHeapSingleton.html" title="struct std::boxed::ExchangeHeapSingleton">ExchangeHeapSingleton</a></code></li>
<li><code>impl<'a, K, V> Placer<V> for <a class="enum" href="../../std/collections/hash_map/enum.Entry.html" title="enum std::collections::hash_map::Entry">Entry</a><'a, K, V></code></li>
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