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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Thread_local (ambient-context.Ambient_context_thread_local.Thread_local)</title><meta charset="utf-8"/><link rel="stylesheet" href="../../../_odoc-theme/odoc.css"/><meta name="generator" content="odoc 2.4.1"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../index.html">ambient-context</a> » <a href="../index.html">Ambient_context_thread_local</a> » Thread_local</nav><header class="odoc-preamble"><h1>Module <code><span>Ambient_context_thread_local.Thread_local</span></code></h1><p>Thread/Domain local storage</p><p>This allows the creation of global state that is per-domain or per-thread.</p></header><div class="odoc-content"><div class="odoc-spec"><div class="spec type anchored" id="type-t"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> <span>'a t</span></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-create"><a href="#val-create" class="anchor"></a><code><span><span class="keyword">val</span> create : <span>unit <span class="arrow">-></span></span> <span><span class="type-var">'a</span> <a href="#type-t">t</a></span></span></code></div><div class="spec-doc"><p>Create new storage</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-get"><a href="#val-get" class="anchor"></a><code><span><span class="keyword">val</span> get : <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span><span class="type-var">'a</span> option</span></span></code></div><div class="spec-doc"><p>Get current value</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-get_exn"><a href="#val-get_exn" class="anchor"></a><code><span><span class="keyword">val</span> get_exn : <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span class="type-var">'a</span></span></code></div><div class="spec-doc"><p>Like <a href="#val-get"><code>get</code></a> but fails with an exception</p><ul class="at-tags"><li class="raises"><span class="at-tag">raises</span> <code>Not_found</code> <p>if no value was found</p></li></ul></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-set"><a href="#val-set" class="anchor"></a><code><span><span class="keyword">val</span> set : <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span><span class="type-var">'a</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-remove"><a href="#val-remove" class="anchor"></a><code><span><span class="keyword">val</span> remove : <span><span><span class="type-var">_</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-get_or_create"><a href="#val-get_or_create" class="anchor"></a><code><span><span class="keyword">val</span> get_or_create : <span><span class="label">create</span>:<span>(<span>unit <span class="arrow">-></span></span> <span class="type-var">'a</span>)</span> <span class="arrow">-></span></span> <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span class="type-var">'a</span></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-with_"><a href="#val-with_" class="anchor"></a><code><span><span class="keyword">val</span> with_ : <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span>(<span><span><span class="type-var">'a</span> option</span> <span class="arrow">-></span></span> <span class="type-var">'b</span>)</span> <span class="arrow">-></span></span> <span class="type-var">'b</span></span></code></div><div class="spec-doc"><p><code>with_ var x f</code> sets <code>var</code> to <code>x</code> for this thread, calls <code>f prev</code> where <code>prev</code> is the value currently in <code>var</code> (if any), and then restores the old value of <code>var</code> for this thread.</p></div></div></div></body></html>
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