Catch/include/internal/catch_interfaces_exception.h

/*
 *  catch_exception_interfaces.h
 *  Catch
 *
 *  Created by Phil on 20/04/2011.
 *  Copyright 2011 Two Blue Cubes Ltd. All rights reserved.
 *
 *  Distributed under the Boost Software License, Version 1.0. (See accompanying
 *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 *
 */
#ifndef TWOBLUECUBES_CATCH_INTERFACES_EXCEPTIONS_H_INCLUDED
#define TWOBLUECUBES_CATCH_INTERFACES_EXCEPTIONS_H_INCLUDED

#include <string>
                                              
namespace Catch
{    
    typedef std::string(*exceptionTranslateFunction)();

    struct IExceptionTranslator
    {
        virtual ~IExceptionTranslator(){}
        virtual std::string translate() const = 0;
    };
    
    struct IExceptionTranslatorRegistry
    {
        virtual ~IExceptionTranslatorRegistry
        ()
        {}
        
        virtual void registerTranslator
            (   IExceptionTranslator* translator 
            ) = 0;
        virtual std::string translateActiveException
            () const = 0;
        
    };

    class ExceptionTranslatorRegistrar
    {
        template<typename T>
        class ExceptionTranslator : public IExceptionTranslator
        {
        public:
            
            ExceptionTranslator
            (
                std::string(*translateFunction)( T& ) 
            )
            : m_translateFunction( translateFunction )
            {}
            
            virtual std::string translate
            ()
            const
            {
                try
                {
                    throw;
                }
                catch( T& ex )
                {
                    return m_translateFunction( ex );
                }
            }
            
        protected:
            std::string(*m_translateFunction)( T& );
        };
        
    public:
        template<typename T>
        ExceptionTranslatorRegistrar
        (
            std::string(*translateFunction)( T& ) 
        )
        {
            Catch::Context::getExceptionTranslatorRegistry().registerTranslator
                ( new ExceptionTranslator<T>( translateFunction ) );
        }
    };
}

///////////////////////////////////////////////////////////////////////////////
#define INTERNAL_CATCH_TRANSLATE_EXCEPTION( signature ) \
    static std::string INTERNAL_CATCH_UNIQUE_NAME( catch_internal_ExceptionTranslator )( signature ); \
    namespace{ Catch::ExceptionTranslatorRegistrar INTERNAL_CATCH_UNIQUE_NAME( catch_internal_ExceptionRegistrar )( &INTERNAL_CATCH_UNIQUE_NAME( catch_internal_ExceptionTranslator ) ); }\
    static std::string INTERNAL_CATCH_UNIQUE_NAME(  catch_internal_ExceptionTranslator )( signature )

#endif // TWOBLUECUBES_CATCH_INTERFACES_EXCEPTIONS_H_INCLUDED