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<title>libsigc++ 2.0: exception_catch()</title>
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<h1>exception_catch()<br>
<small>
[<a class="el" href="group__adaptors.html">Adaptors</a>]</small>
</h1><a class="el" href="namespacesigc.html#a31">sigc::exception_catch()</a> catches an exception thrown from within the wrapped functor and directs it to a catcher functor.
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This catcher can then rethrow the exception and catch it with the proper type.<p>
Note that the catcher is expected to return the same type as the wrapped functor so that normal flow can continue.<p>
Catchers can be cascaded to catch multiple types because uncaught rethrown exceptions proceed to the next catcher adaptor.<p>
<dl compact><dt><b>Examples:</b></dt><dd><div class="fragment"><pre class="fragment"> <span class="keyword">struct </span>my_catch
{
<span class="keywordtype">int</span> operator()()
{
<span class="keywordflow">try</span> { <span class="keywordflow">throw</span>; }
<span class="keywordflow">catch</span> (std::range_error e) <span class="comment">// catch what types we know</span>
{ std::cerr << <span class="stringliteral">"caught "</span> << e.what() << std::endl; }
<span class="keywordflow">return</span> 1;
}
}
<span class="keywordtype">int</span> foo(); <span class="comment">// throws std::range_error</span>
<a class="code" href="namespacesigc.html#a31">sigc::exception_catch</a>(&foo, my_catch())();
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The functor sigc::execption_catch() returns can be passed into <a class="el" href="classsigc_1_1signal7.html#a0">sigc::signal::connect()</a> directly.<p>
<dl compact><dt><b>Example:</b></dt><dd><div class="fragment"><pre class="fragment"> <a class="code" href="classsigc_1_1signal.html">sigc::signal<int></a> some_signal;
some_signal.<a class="code" href="classsigc_1_1signal7.html#a0">connect</a>(sigc::exception_catch(&foo, my_catch));
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