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<title>Fun</title>
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<h1>Module <a href="type_Fun.html">Fun</a></h1>
<pre><span id="MODULEFun"><span class="keyword">module</span> Fun</span>: <code class="code"><span class="keyword">sig</span></code> <a href="Fun.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><div class="info module top">
<div class="info-desc">
<p>Function manipulation.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
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<hr width="100%">
<h2 id="combinators">Combinators</h2>
<pre><span id="VALid"><span class="keyword">val</span> id</span> : <code class="type">'a -> 'a</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">id</code> is the identity function. For any argument <code class="code">x</code>, <code class="code">id x</code> is <code class="code">x</code>.</p>
</div>
</div>
<pre><span id="VALconst"><span class="keyword">val</span> const</span> : <code class="type">'a -> 'b -> 'a</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">const c</code> is a function that always returns the value <code class="code">c</code>. For any
argument <code class="code">x</code>, <code class="code">(const c) x</code> is <code class="code">c</code>.</p>
</div>
</div>
<pre><span id="VALflip"><span class="keyword">val</span> flip</span> : <code class="type">('a -> 'b -> 'c) -> 'b -> 'a -> 'c</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">flip f</code> reverses the argument order of the binary function
<code class="code">f</code>. For any arguments <code class="code">x</code> and <code class="code">y</code>, <code class="code">(flip f) x y</code> is <code class="code">f y x</code>.</p>
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<pre><span id="VALnegate"><span class="keyword">val</span> negate</span> : <code class="type">('a -> bool) -> 'a -> bool</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">negate p</code> is the negation of the predicate function <code class="code">p</code>. For any
argument <code class="code">x</code>, <code class="code">(negate p) x</code> is <code class="code">not (p x)</code>.</p>
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<h2 id="exception">Exception handling</h2>
<pre><span id="VALprotect"><span class="keyword">val</span> protect</span> : <code class="type">finally:(unit -> unit) -> (unit -> 'a) -> 'a</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">protect ~finally work</code> invokes <code class="code">work ()</code> and then <code class="code">finally ()</code>
before <code class="code">work ()</code> returns with its value or an exception. In the
latter case the exception is re-raised after <code class="code">finally ()</code>. If
<code class="code">finally ()</code> raises an exception, then the exception
<a href="Fun.html#EXCEPTIONFinally_raised"><code class="code"><span class="constructor">Fun</span>.<span class="constructor">Finally_raised</span></code></a> is raised instead.</p>
<p><code class="code">protect</code> can be used to enforce local invariants whether <code class="code">work ()</code>
returns normally or raises an exception. However, it does not
protect against unexpected exceptions raised inside <code class="code">finally ()</code>
such as <a href="Stdlib.html#EXCEPTIONOut_of_memory"><code class="code"><span class="constructor">Out_of_memory</span></code></a>, <a href="Stdlib.html#EXCEPTIONStack_overflow"><code class="code"><span class="constructor">Stack_overflow</span></code></a>, or
asynchronous exceptions raised by signal handlers
(e.g. <a href="Sys.html#EXCEPTIONBreak"><code class="code"><span class="constructor">Sys</span>.<span class="constructor">Break</span></code></a>).</p>
<p>Note: It is a <em>programming error</em> if other kinds of exceptions
are raised by <code class="code">finally</code>, as any exception raised in <code class="code">work ()</code> will
be lost in the event of a <a href="Fun.html#EXCEPTIONFinally_raised"><code class="code"><span class="constructor">Fun</span>.<span class="constructor">Finally_raised</span></code></a> exception. Therefore,
one should make sure to handle those inside the finally.</p>
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<pre><span id="EXCEPTIONFinally_raised"><span class="keyword">exception</span> Finally_raised</span> <span class="keyword">of</span> <code class="type">exn</code></pre>
<div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Finally_raised</span> exn</code> is raised by <code class="code">protect ~finally work</code> when
<code class="code">finally</code> raises an exception <code class="code">exn</code>. This exception denotes either
an unexpected exception or a programming error. As a general rule,
one should not catch a <code class="code"><span class="constructor">Finally_raised</span></code> exception except as part of
a catch-all handler.</p>
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