59 lines
2 KiB
C++
59 lines
2 KiB
C++
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#include <iostream>
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#include <iomanip>
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#include <string>
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#include <sstream>
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#include <stdexcept>
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#include "exceptions/exceptions.h"
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// Use this macro to build up your hierarchy of exceptions
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EXCEPTION( Exception, Existential_Observation );
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EXCEPTION( Existential_Observation, Buddhist_Observation );
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EXCEPTION( Buddhist_Observation, Zen_Observation );
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EXCEPTION( Existential_Observation, Pastafarism_Observation );
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// A somewhat similar code without this tool would be:
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// Inherit from runtime_error, because it has a virtual `what` interface.
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class _Existential_Observation : public std::runtime_error
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{ public:
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// Pass through constructors
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_Existential_Observation( const std::string & what_arg ) : std::runtime_error(what_arg) {}
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};
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class _Buddhist_Observation : public _Existential_Observation
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{ public:
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_Buddhist_Observation( const std::string & what_arg ) : _Existential_Observation(what_arg) {}
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};
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int main()
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{
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try {
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double pi = 3.1415926535;
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// Use this macro to easily throw an exception with a dynamic message
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RAISE( Pastafarism_Observation, std::setprecision(3) << "Shit happens with " << pi << " noodly appendages" );
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// Or, if you prefer, use the standard `throw` function, but you'll have to indicate E_INFOS by yourself
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throw( Zen_Observation( "What is the sound of shit happening?", E_INFOS) );
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} catch( Existential_Observation & e ) {
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std::cerr << e.what() << std::endl;
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}
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// Using the standard way, you will have to do
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try {
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std::ostringstream msg;
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double vacuity = 0;
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// Beware of the hard-coded class name...
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msg << "There is " << vacuity << " shit happening (<_Buddhist_Observation in " << __FUNCTION__ << " at " << __FILE__ << ":" << __LINE__ << ")";
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// And don't forget the string conversion.
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throw( _Buddhist_Observation( msg.str() ) );
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} catch( _Existential_Observation & e ) {
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std::cerr << e.what() << std::endl;
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}
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}
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