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168 lines
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<title>lazycell - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'>Crate lazycell</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'lazycell', ty: 'mod', relpath: '../'};</script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>lazycell</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/lazycell/lib.rs.html#11-414' title='goto source code'>[src]</a></span></h1><div class='docblock'><p>This crate provides a <code>LazyCell</code> struct which acts as a lazily filled
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<code>Cell</code>, but with frozen contents.</p>
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<p>With a <code>RefCell</code>, the inner contents cannot be borrowed for the lifetime of
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the entire object, but only of the borrows returned. A <code>LazyCell</code> is a
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variation on <code>RefCell</code> which allows borrows to be tied to the lifetime of
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the outer object.</p>
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<p>The limitation of a <code>LazyCell</code> is that after it is initialized and shared,
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it can be modified.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<p>The following example shows a quick example of the basic functionality of
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<code>LazyCell</code>.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">lazycell</span>::<span class="ident">LazyCell</span>;
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<span class="kw">let</span> <span class="ident">lazycell</span> <span class="op">=</span> <span class="ident">LazyCell</span>::<span class="ident">new</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">lazycell</span>.<span class="ident">borrow</span>(), <span class="prelude-val">None</span>);
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<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">lazycell</span>.<span class="ident">filled</span>());
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<span class="ident">lazycell</span>.<span class="ident">fill</span>(<span class="number">1</span>).<span class="ident">ok</span>();
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">lazycell</span>.<span class="ident">filled</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">lazycell</span>.<span class="ident">borrow</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">lazycell</span>.<span class="ident">into_inner</span>(), <span class="prelude-val">Some</span>(<span class="number">1</span>));</pre>
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<p><code>AtomicLazyCell</code> is a variant that uses an atomic variable to manage
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coordination in a thread-safe fashion.</p>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.AtomicLazyCell.html"
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title='struct lazycell::AtomicLazyCell'>AtomicLazyCell</a></td>
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<td class='docblock-short'>
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<p>A lazily filled <code>Cell</code>, with frozen contents.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.LazyCell.html"
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title='struct lazycell::LazyCell'>LazyCell</a></td>
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<td class='docblock-short'>
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<p>A lazily filled <code>Cell</code>, with frozen contents.</p>
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</td>
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