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   8 <title>libsigc++: exception_catch()</title>
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  22    <div id="projectname">libsigc++
  23    &#160;<span id="projectnumber">2.10.8</span>
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  44 <div class="title">exception_catch()<div class="ingroups"><a class="el" href="group__adaptors.html">Adaptors</a></div></div>  </div>
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  47
  48 <p><a class="el" href="namespacesigc.html#a0ae3b8a1ba26920cee4d7d9df2c39ed9">sigc::exception_catch()</a> catches an exception thrown from within the wrapped functor and directs it to a catcher functor.
  49 </p>
  50 <p><a class="el" href="namespacesigc.html#a0ae3b8a1ba26920cee4d7d9df2c39ed9">sigc::exception_catch()</a> catches an exception thrown from within the wrapped functor and directs it to a catcher functor. </p>
  51 <p>This catcher can then rethrow the exception and catch it with the proper type.</p>
  52 <p>Note that the catcher is expected to return the same type as the wrapped functor so that normal flow can continue.</p>
  53 <p>Catchers can be cascaded to catch multiple types, because uncaught rethrown exceptions proceed to the next catcher adaptor.</p>
  54 <dl class="section user"><dt>Examples:</dt><dd><div class="fragment"><div class="line"><span class="keyword">struct </span>my_catch</div>
  55 <div class="line">{</div>
  56 <div class="line">  <span class="keywordtype">int</span> operator()()</div>
  57 <div class="line">  {</div>
  58 <div class="line">    <span class="keywordflow">try</span> { <span class="keywordflow">throw</span>; }</div>
  59 <div class="line">    <span class="keywordflow">catch</span> (<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02969.html">std::range_error</a> e) <span class="comment">// catch what types we know</span></div>
  60 <div class="line">      { <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01635.html#a7431d56d1e8cd7a9b854171294bd71c7">std::cerr</a> &lt;&lt; <span class="stringliteral">&quot;caught &quot;</span> &lt;&lt; e.<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02965.html#a45f5b9c4b7141ac429bf6ea99a7ff6bf">what</a>() &lt;&lt; <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01635.html#a8b3758bb8f17c440c7963363f42f69f3">std::endl</a>; }</div>
  61 <div class="line">    <span class="keywordflow">return</span> 1;</div>
  62 <div class="line">  }</div>
  63 <div class="line">}</div>
  64 <div class="line"><span class="keywordtype">int</span> foo(); <span class="comment">// throws std::range_error</span></div>
  65 <div class="line"><a class="code" href="namespacesigc.html#a0ae3b8a1ba26920cee4d7d9df2c39ed9">sigc::exception_catch</a>(&amp;foo, my_catch())();</div>
  66 <div class="ttc" id="aa01635_html_a7431d56d1e8cd7a9b854171294bd71c7"><div class="ttname"><a href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01635.html#a7431d56d1e8cd7a9b854171294bd71c7">std::cerr</a></div><div class="ttdeci">ostream cerr</div></div>
  67 <div class="ttc" id="aa01635_html_a8b3758bb8f17c440c7963363f42f69f3"><div class="ttname"><a href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01635.html#a8b3758bb8f17c440c7963363f42f69f3">std::endl</a></div><div class="ttdeci">basic_ostream&lt; _CharT, _Traits &gt; &amp; endl(basic_ostream&lt; _CharT, _Traits &gt; &amp;__os)</div></div>
  68 <div class="ttc" id="aa02965_html_a45f5b9c4b7141ac429bf6ea99a7ff6bf"><div class="ttname"><a href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02965.html#a45f5b9c4b7141ac429bf6ea99a7ff6bf">std::range_error::what</a></div><div class="ttdeci">virtual const char * what() const noexcept</div></div>
  69 <div class="ttc" id="aa02969_html"><div class="ttname"><a href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02969.html">std::range_error</a></div></div>
  70 <div class="ttc" id="anamespacesigc_html_a0ae3b8a1ba26920cee4d7d9df2c39ed9"><div class="ttname"><a href="namespacesigc.html#a0ae3b8a1ba26920cee4d7d9df2c39ed9">sigc::exception_catch</a></div><div class="ttdeci">exception_catch_functor&lt; T_functor, T_catcher &gt; exception_catch(const T_functor &amp;_A_func, const T_catcher &amp;_A_catcher)</div><div class="ttdef"><b>Definition:</b> exception_catch.h:326</div></div>
  71 </div><!-- fragment --></dd></dl>
  72 <p>The functor <a class="el" href="namespacesigc.html#a0ae3b8a1ba26920cee4d7d9df2c39ed9">sigc::exception_catch()</a> returns can be directly passed into <a class="el" href="classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2" title="Add a slot to the list of slots.">sigc::signal::connect()</a>.</p>
  73 <dl class="section user"><dt>Example:</dt><dd><div class="fragment"><div class="line"><a class="code" href="classsigc_1_1signal.html">sigc::signal&lt;int&gt;</a> some_signal;</div>
  74 <div class="line">some_signal.<a class="code" href="classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2">connect</a>(<a class="code" href="namespacesigc.html#a0ae3b8a1ba26920cee4d7d9df2c39ed9">sigc::exception_catch</a>(&amp;foo, my_catch));</div>
  75 <div class="ttc" id="aclasssigc_1_1signal7_html_adc55ac9b0f935fd87a67904022e03cb2"><div class="ttname"><a href="classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2">sigc::signal7::connect</a></div><div class="ttdeci">iterator connect(const slot_type &amp;slot_)</div><div class="ttdoc">Add a slot to the list of slots.</div><div class="ttdef"><b>Definition:</b> signal.h:3871</div></div>
  76 <div class="ttc" id="aclasssigc_1_1signal_html"><div class="ttname"><a href="classsigc_1_1signal.html">sigc::signal</a></div><div class="ttdoc">Convenience wrapper for the numbered sigc::signal# templates.</div><div class="ttdef"><b>Definition:</b> signal.h:4015</div></div>
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