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<title>libsigc++: exception_catch()</title>
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<h1>exception_catch()<br/>
<small>
[<a class="el" href="group__adaptors.html">Adaptors</a>]</small>
</h1>
<p>sigc::exception_catch() catches an exception thrown from within the wrapped functor and directs it to a catcher functor. <a href="#_details">More...</a></p>
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<p>sigc::exception_catch() catches an exception thrown from within the wrapped functor and directs it to a catcher functor. </p>
<p>This catcher can then rethrow the exception and catch it with the proper type.</p>
<p>Note that the catcher is expected to return the same type as the wrapped functor so that normal flow can continue.</p>
<p>Catchers can be cascaded to catch multiple types because uncaught rethrown exceptions proceed to the next catcher adaptor.</p>
<dl class="user"><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> (<a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00639.html">std::range_error</a> e) <span class="comment">// catch what types we know</span>
{ <a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01116.html#a7431d56d1e8cd7a9b854171294bd71c7">std::cerr</a> << <span class="stringliteral">"caught "</span> << e.<a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00669.html#ae3ab99c81fd42c6d1db9d9e42b3eddde">what</a>() << <a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01116.html#a75c5d34c6c0dcd2c1a01307dbf6ad8c5">std::endl</a>; }
<span class="keywordflow">return</span> 1;
}
}
<span class="keywordtype">int</span> foo(); <span class="comment">// throws std::range_error</span>
sigc::exception_catch(&foo, my_catch())();
</pre></div></dd></dl>
<p>The functor sigc::execption_catch() returns can be passed into <a class="el" href="classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2" title="Add a slot to the list of slots.">sigc::signal::connect()</a> directly.</p>
<dl class="user"><dt><b>Example:</b></dt><dd><div class="fragment"><pre class="fragment"> <a class="code" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">sigc::signal<int></a> some_signal;
some_signal.<a class="code" href="classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2" title="Add a slot to the list of slots.">connect</a>(sigc::exception_catch(&foo, my_catch));
</pre></div> </dd></dl>
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<hr size="1"/><address style="text-align: right;"><small>Generated on Tue May 4 21:44:39 2010 for libsigc++ by 
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