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compound.cpp</title>
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<span class=comment>// file : Example/ExH/Compound/compound.cpp
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2002-2003 Boris Kolpackov
// license : http://kolpackov.net/license.html
</span><span class=preprocessor>#include "Utility/ExH/Compound.hpp"
</span><span class=preprocessor>#include "Utility/ExH/System/Exception.hpp"
</span><span class=preprocessor>#include "Utility/ExH/Logic/DescriptiveException.hpp"
</span><span class=comment>// Include some helper converters to allow exception initialization
// with std::ostringstream
</span><span class=preprocessor>#include "Utility/ExH/StringStreamConverter.hpp"
</span><span class=preprocessor>#include <iostream>
</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>using </span><span class=identifier>std</span><span class=special>::</span><span class=identifier>string</span><span class=special>;
</span><span class=keyword>using </span><span class=identifier>std</span><span class=special>::</span><span class=identifier>ostringstream</span><span class=special>;
</span><span class=keyword>using </span><span class=keyword>namespace </span><span class=identifier>Utility</span><span class=special>::</span><span class=identifier>ExH</span><span class=special>;
</span><span class=comment>// Here are our components
</span><span class=keyword>class </span><span class=identifier>Base
</span><span class=special>{
</span><span class=keyword>public</span><span class=special>:
</span><span class=comment>//
// Exception definitions.
//
// Base logic exception class for component.
</span><span class=keyword>class </span><span class=identifier>Exception_ </span><span class=special>{};
</span><span class=keyword>typedef
</span><span class=identifier>Compound </span><span class=special><</span><span class=identifier>Exception_</span><span class=special>, </span><span class=identifier>Logic</span><span class=special>::</span><span class=identifier>DescriptiveException</span><span class=special>>
</span><span class=identifier>Exception</span><span class=special>;
</span><span class=keyword>class </span><span class=identifier>InvalidArgument_ </span><span class=special>{};
</span><span class=keyword>typedef
</span><span class=identifier>Compound </span><span class=special><</span><span class=identifier>InvalidArgument_</span><span class=special>, </span><span class=identifier>Exception</span><span class=special>>
</span><span class=identifier>InvalidArgument</span><span class=special>;
</span><span class=keyword>class </span><span class=identifier>NotInitialized_ </span><span class=special>{};
</span><span class=keyword>typedef
</span><span class=identifier>Compound </span><span class=special><</span><span class=identifier>NotInitialized_</span><span class=special>, </span><span class=identifier>Exception</span><span class=special>>
</span><span class=identifier>NotInitialized</span><span class=special>;
</span><span class=keyword>public</span><span class=special>:
</span><span class=keyword>void
</span><span class=identifier>foo </span><span class=special>(</span><span class=keyword>char </span><span class=keyword>const</span><span class=special>* </span><span class=identifier>str</span><span class=special>) </span><span class=keyword>throw </span><span class=special>(</span><span class=identifier>InvalidArgument</span><span class=special>, </span><span class=identifier>NotInitialized</span><span class=special>)
</span><span class=special>{
</span><span class=comment>// This is just an example.
</span><span class=keyword>if </span><span class=special>(</span><span class=identifier>str </span><span class=special>== </span><span class=number>0</span><span class=special>)
</span><span class=special>{
</span><span class=keyword>throw </span><span class=identifier>InvalidArgument </span><span class=special>(</span><span class=string>"Base::foo: first parameter is zero."</span><span class=special>);
</span><span class=special>}
</span><span class=keyword>else
</span><span class=special>{
</span><span class=identifier>ostringstream </span><span class=identifier>ostr</span><span class=special>;
</span><span class=identifier>ostr </span><span class=special><< </span><span class=string>"Base::foo [this = " </span><span class=special><< </span><span class=keyword>this </span><span class=special><< </span><span class=string>"]: object is not initialized."</span><span class=special>;
</span><span class=keyword>throw </span><span class=identifier>NotInitialized </span><span class=special>(</span><span class=identifier>ostr</span><span class=special>);
</span><span class=special>}
</span><span class=special>}
</span><span class=comment>// We don't know what implementation may decide to throw so
// we allow to throw System exception and any logic exception
// derived from Base::Exception
</span><span class=keyword>virtual </span><span class=keyword>void
</span><span class=identifier>vfoo </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=identifier>System</span><span class=special>::</span><span class=identifier>Exception</span><span class=special>) </span><span class=special>= </span><span class=number>0</span><span class=special>;
</span><span class=special>};
</span><span class=keyword>class </span><span class=identifier>Derived </span><span class=special>: </span><span class=keyword>public </span><span class=identifier>Base
</span><span class=special>{
</span><span class=keyword>public</span><span class=special>:
</span><span class=comment>// Define some Derived-specific logic exception.
</span><span class=keyword>class </span><span class=identifier>NotImplemented_ </span><span class=special>{};
</span><span class=keyword>typedef
</span><span class=identifier>Compound </span><span class=special><</span><span class=identifier>NotImplemented_</span><span class=special>, </span><span class=identifier>Exception</span><span class=special>>
</span><span class=identifier>NotImplemented</span><span class=special>;
</span><span class=keyword>public</span><span class=special>:
</span><span class=keyword>virtual </span><span class=keyword>void
</span><span class=identifier>vfoo </span><span class=special>() </span><span class=keyword>throw </span><span class=special>(</span><span class=identifier>NotImplemented</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>std</span><span class=special>::</span><span class=identifier>string </span><span class=identifier>str </span><span class=special>(</span><span class=string>"Derived::vfoo: not implemented yet."</span><span class=special>);
</span><span class=keyword>throw </span><span class=identifier>NotImplemented </span><span class=special>(</span><span class=identifier>str</span><span class=special>);
</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>Derived </span><span class=identifier>d</span><span class=special>;
</span><span class=identifier>Base</span><span class=special>* </span><span class=identifier>pb </span><span class=special>(&</span><span class=identifier>d</span><span class=special>);
</span><span class=comment>// We can use generic handler.
</span><span class=keyword>try
</span><span class=special>{
</span><span class=identifier>pb</span><span class=special>-></span><span class=identifier>vfoo </span><span class=special>();
</span><span class=special>}
</span><span class=keyword>catch </span><span class=special>(</span><span class=identifier>Base</span><span class=special>::</span><span class=identifier>Exception </span><span class=keyword>const</span><span class=special>& </span><span class=identifier>ex</span><span class=special>)
</span><span class=special>{
</span><span class=identifier>cerr </span><span class=special><< </span><span class=string>"Caught Base::Exception: " </span><span class=special><< </span><span class=identifier>ex</span><span class=special>.</span><span class=identifier>what </span><span class=special>() </span><span class=special><< </span><span class=identifier>endl</span><span class=special>;
</span><span class=special>}
</span><span class=comment>// Or use more precise control.
</span><span class=keyword>try
</span><span class=special>{
</span><span class=identifier>pb</span><span class=special>-></span><span class=identifier>foo </span><span class=special>(</span><span class=string>"hello"</span><span class=special>);
</span><span class=special>}
</span><span class=keyword>catch </span><span class=special>(</span><span class=identifier>Base</span><span class=special>::</span><span class=identifier>NotInitialized </span><span class=keyword>const</span><span class=special>& </span><span class=identifier>ex</span><span class=special>)
</span><span class=special>{
</span><span class=identifier>cerr </span><span class=special><< </span><span class=string>"Caught Base::NotInitialized: " </span><span class=special><< </span><span class=identifier>ex</span><span class=special>.</span><span class=identifier>what </span><span class=special>() </span><span class=special><< </span><span class=identifier>endl</span><span class=special>;
</span><span class=special>}
</span><span class=comment>// Or use application-level handler.
</span><span class=identifier>pb</span><span class=special>-></span><span class=identifier>foo </span><span class=special>(</span><span class=number>0</span><span class=special>);
</span><span class=special>}
</span><span class=keyword>catch </span><span class=special>(</span><span class=identifier>Logic</span><span class=special>::</span><span class=identifier>Exception </span><span class=keyword>const</span><span class=special>& </span><span class=identifier>ex</span><span class=special>)
</span><span class=special>{
</span><span class=identifier>cerr </span><span class=special><< </span><span class=string>"Caught Logic::Exception: " </span><span class=special><< </span><span class=identifier>ex</span><span class=special>.</span><span class=identifier>what </span><span class=special>() </span><span class=special><< </span><span class=identifier>endl</span><span class=special>;
</span><span class=special>}
</span><span class=keyword>catch </span><span class=special>(...)
</span><span class=special>{
</span><span class=identifier>cerr </span><span class=special><< </span><span class=string>"Caught unknown exception using catch-all handler" </span><span class=special><< </span><span class=identifier>endl</span><span class=special>;
</span><span class=keyword>return </span><span class=special>-</span><span class=number>1</span><span class=special>;
</span><span class=special>}
</span><span class=special>}
</span></pre>
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