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<title>scoped_tls - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'>Crate scoped_tls</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#macros">Macros</a></li><li><a href="#structs">Structs</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'scoped_tls', ty: 'mod', relpath: '../'};</script></div>
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<h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>scoped_tls</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/scoped_tls/lib.rs.html#11-269' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>Scoped thread-local storage</p>
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<p>This module provides the ability to generate <em>scoped</em> thread-local
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variables. In this sense, scoped indicates that thread local storage
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actually stores a reference to a value, and this reference is only placed
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in storage for a scoped amount of time.</p>
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<p>There are no restrictions on what types can be placed into a scoped
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variable, but all scoped variables are initialized to the equivalent of
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null. Scoped thread local storage is useful when a value is present for a known
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period of time and it is not required to relinquish ownership of the
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contents.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">scoped_tls</span>;
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<span class="macro">scoped_thread_local</span><span class="macro">!</span>(<span class="kw">static</span> <span class="ident">FOO</span>: <span class="ident">u32</span>);
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<span class="comment">// Initially each scoped slot is empty.</span>
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<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">FOO</span>.<span class="ident">is_set</span>());
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<span class="comment">// When inserting a value, the value is only in place for the duration</span>
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<span class="comment">// of the closure specified.</span>
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<span class="ident">FOO</span>.<span class="ident">set</span>(<span class="kw-2">&</span><span class="number">1</span>, <span class="op">||</span> {
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<span class="ident">FOO</span>.<span class="ident">with</span>(<span class="op">|</span><span class="ident">slot</span><span class="op">|</span> {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">slot</span>, <span class="number">1</span>);
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});
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});</pre>
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</div><h2 id='macros' class='section-header'><a href="#macros">Macros</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="macro" href="macro.scoped_thread_local.html"
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title='macro scoped_tls::scoped_thread_local'>scoped_thread_local</a></td>
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<td class='docblock-short'>
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</td>
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</tr></table><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.ScopedKey.html"
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title='struct scoped_tls::ScopedKey'>ScopedKey</a></td>
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<td class='docblock-short'>
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<p>Type representing a thread local storage key corresponding to a reference
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to the type parameter <code>T</code>.</p>
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