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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Callback (ocaml.Stdlib.Callback)</title><link rel="stylesheet" href="../../../_odoc-theme/odoc.css"/><meta charset="utf-8"/><meta name="generator" content="odoc 2.2.1"/><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">ocaml</a> » <a href="../index.html">Stdlib</a> » Callback</nav><header class="odoc-preamble"><h1>Module <code><span>Stdlib.Callback</span></code></h1><p>Registering OCaml values with the C runtime.</p><p>This module allows OCaml values to be registered with the C runtime under a symbolic name, so that C code can later call back registered OCaml functions, or raise registered OCaml exceptions.</p></header><div class="odoc-content"><div class="odoc-spec"><div class="spec value anchored" id="val-register"><a href="#val-register" class="anchor"></a><code><span><span class="keyword">val</span> register : <span>string <span class="arrow">-></span></span> <span><span class="type-var">'a</span> <span class="arrow">-></span></span> unit</span></code></div><div class="spec-doc"><p><code>Callback.register n v</code> registers the value <code>v</code> under the name <code>n</code>. C code can later retrieve a handle to <code>v</code> by calling <code>caml_named_value(n)</code>.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-register_exception"><a href="#val-register_exception" class="anchor"></a><code><span><span class="keyword">val</span> register_exception : <span>string <span class="arrow">-></span></span> <span>exn <span class="arrow">-></span></span> unit</span></code></div><div class="spec-doc"><p><code>Callback.register_exception n exn</code> registers the exception contained in the exception value <code>exn</code> under the name <code>n</code>. C code can later retrieve a handle to the exception by calling <code>caml_named_value(n)</code>. The exception value thus obtained is suitable for passing as first argument to <code>raise_constant</code> or <code>raise_with_arg</code>.</p></div></div></div></body></html> |