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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Netexn</title>
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<h1>Module <a href="type_Netexn.html">Netexn</a></h1>
<pre><span id="MODULENetexn"><span class="keyword">module</span> Netexn</span>: <code class="code">sig</code> <a href="Netexn.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Exception registry</p>
<p>This module allow the user to register exceptions, and to set a
custom exception printing function. This results in nicer exception
prints when <code class="code">Netexn.to_string</code> is called instead of <code class="code">Printexc.to_string</code>.</p>
<p>Generally, <code class="code">Printexc.to_string</code> works well if:</p>
<ul>
<li>the exception does not have arguments, or</li>
<li>all arguments are int's or string's.</li>
</ul>
<p>In these cases it is not required to register a custom printer. Arguments
that are neither int nor string are printed as "_", however, so defining
a custom printer helps then.</p>
<p>The printers registered here are intended for helping debugging, so
the goal is to print all of the exception in an unambiguous way.
The syntax "Exception(arg1, arg2, ...)" is preferred.</p>
<p><b>Since OCaml 3.11.2 there is a similar feature in <code class="code">Printexc</code>.</b>
If Ocamlnet recognizes that <code class="code">Printexc.register_printer</code> is available,
all functions registered in this module are also registered at
the central <code class="code">Printexc</code> registry. For users it does not make a difference
then whether <code class="code">Netexn.to_string</code> or <code class="code">Printexc.to_string</code> is called
to print the exception. We recommend, however, to use <code class="code">Netexn</code> as
primary registry for all code that uses Ocamlnet because this
mechanism also works for older Ocaml versions, and is slightly more
efficient.</p>
</div>
</div>
<hr width="100%">
<pre><span id="VALregister_printer"><span class="keyword">val</span> register_printer</span> : <code class="type">exn -> (exn -> string) -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">register e f</code>: Register that the exception type of the sample
exception <code class="code">e</code> is to be printed by <code class="code">f</code>.</p>
<p>In multi-threaded programs, this function should no longer be called
once threads have been spawned.</p>
</div>
</div>
<pre><span id="VALto_string"><span class="keyword">val</span> to_string</span> : <code class="type">exn -> string</code></pre><div class="info ">
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<p>Prints the exception as string, using the registered printer functions,
or <code class="code">Printexc.to_string</code> as fallback if there is no better printer</p>
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