contrib/utility/Documentation/ExH/Example/logic_to_system.cpp.html


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logic_to_system.cpp</title>
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<span class=comment>// file      : Example/ExH/LogicToSystem/logic_to_system.cpp
// author    : Boris Kolpackov &lt;boris@kolpackov.net&gt;
// copyright : Copyright (c) 2002-2003 Boris Kolpackov
// license   : http://kolpackov.net/license.html

</span><span class=preprocessor>#include &quot;Utility/ExH/System/Exception.hpp&quot;
</span><span class=preprocessor>#include &quot;Utility/ExH/Logic/Exception.hpp&quot;

</span><span class=preprocessor>#include &lt;iostream&gt;

</span><span class=keyword>using </span><span class=identifier>std</span><span class=special>::</span><span class=identifier>cerr</span><span class=special>;
</span><span class=keyword>using </span><span class=identifier>std</span><span class=special>::</span><span class=identifier>endl</span><span class=special>;


</span><span class=keyword>struct </span><span class=identifier>SubsystemA
</span><span class=special>{
  </span><span class=keyword>class </span><span class=identifier>Exception </span><span class=special>: </span><span class=keyword>public </span><span class=identifier>Utility</span><span class=special>::</span><span class=identifier>ExH</span><span class=special>::</span><span class=identifier>Logic</span><span class=special>::</span><span class=identifier>Exception </span><span class=special>{};

  </span><span class=keyword>void
  </span><span class=identifier>foo </span><span class=special>() </span><span class=keyword>throw </span><span class=special>(</span><span class=identifier>Exception</span><span class=special>)
  </span><span class=special>{
    </span><span class=keyword>throw </span><span class=identifier>Exception </span><span class=special>();
  </span><span class=special>}
</span><span class=special>};


</span><span class=keyword>struct </span><span class=identifier>SubsystemB
</span><span class=special>{
  </span><span class=keyword>void
  </span><span class=identifier>foo </span><span class=special>() </span><span class=keyword>throw </span><span class=special>(</span><span class=identifier>Utility</span><span class=special>::</span><span class=identifier>ExH</span><span class=special>::</span><span class=identifier>System</span><span class=special>::</span><span class=identifier>Exception</span><span class=special>)
  </span><span class=special>{
    </span><span class=identifier>SubsystemA </span><span class=identifier>a</span><span class=special>;
    </span><span class=identifier>a</span><span class=special>.</span><span class=identifier>foo </span><span class=special>();

    </span><span class=comment>// Here SubsystemB is using SunsystemA but cannot (forgot, doesnt't
    // want to, doesn't know how to, etc - pick your favorite) handle
    // exception thrown by SubsystemA. As a result exception is
    // 'converted' to System::Exception.
  </span><span class=special>}
</span><span class=special>};


</span><span class=keyword>int
</span><span class=identifier>main </span><span class=special>()
</span><span class=special>{
  </span><span class=keyword>try
  </span><span class=special>{
    </span><span class=identifier>SubsystemB </span><span class=identifier>b</span><span class=special>;
    </span><span class=identifier>b</span><span class=special>.</span><span class=identifier>foo </span><span class=special>();
  </span><span class=special>}
  </span><span class=keyword>catch </span><span class=special>(</span><span class=identifier>Utility</span><span class=special>::</span><span class=identifier>ExH</span><span class=special>::</span><span class=identifier>System</span><span class=special>::</span><span class=identifier>Exception </span><span class=keyword>const</span><span class=special>&amp; </span><span class=identifier>ex</span><span class=special>)
  </span><span class=special>{
    </span><span class=identifier>cerr </span><span class=special>&lt;&lt; </span><span class=string>&quot;Caught Utility::ExH::System::Exception: &quot;
         </span><span class=special>&lt;&lt; </span><span class=identifier>ex</span><span class=special>.</span><span class=identifier>what </span><span class=special>()
         </span><span class=special>&lt;&lt; </span><span class=identifier>endl</span><span class=special>;
  </span><span class=special>}
</span><span class=special>}
</span></pre>
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