cExceptionBase.h

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//
 
#ifndef _INC_cExceptionBase_H
#define _INC_cExceptionBase_H
#ifndef NO_PRAGMA_ONCE
#pragma once
#endif
 
#include "cPtrFacade.h"
#include "StrT.h"
#include "cObject.h"
#include "cLogLevel.h"
#ifndef _MFC_VER        // NOT using _MFC_VER.
#include <exception> // use STL based exception class.
#endif
 
namespace Gray
{
 
#if ! defined(_CPPUNWIND)       // STL _HAS_EXCEPTIONS
        class cExceptionBase    // stub this out if no throws allowed.
        {
        public:
                virtual ~cExceptionBase()
                {
                }
                virtual const char* what() const THROW_DEF = 0; // can throw ? strange.
        };
#elif defined(_MFC_VER)
        // MFC throw a pointer to this structure to track an error. must call Delete() to destruct.
        // NOTE: cannot be instantiated on the stack. MUST be "new CException" as per MFC rules.
        // base for to MFC CFileException is CException
        typedef ::CException cExceptionBase;                    
#else
        // throw a reference to this structure to track an error. auto destruct as normal class.
        typedef std::exception cExceptionBase;                  
#endif
 
        class GRAYCORE_LINK cException; // Base for my custom exceptions. Also based on cExceptionBase
        
        // Abstract the several different types of exception handling as macros.
#if ! defined(_CPPUNWIND)       // No exception allowed. use STL _HAS_EXCEPTIONS ?
        // #define GRAY_THROW           // no throws allowed.
#define GRAY_TRY                                if (true) {
#define GRAY_TRY_CATCH(c,ex)    } else if (false) {
#define GRAY_TRY_CATCHALL               } else {
#define GRAY_TRY_END                    }
#elif defined(_MFC_VER)
        // MFC TRY/CATCH/AND_CATCH/END_CATCH
#define GRAY_THROW                              throw new // throw dynamic "new" pointer (MFC). This is usually BAD practice in modern times.
#define GRAY_TRY                                TRY
#define GRAY_TRY_CATCH(c,ex)    CATCH(c,ex)             // c=cExceptionBase
#define GRAY_TRY_CATCHALL               CATCH(CException,ex)    // CATCH_ALL is weird. needs END_CATCH_ALL
#define GRAY_TRY_END                    END_CATCH
#elif defined(_MSC_VER)
        // STL xstddef _TRY_BEGIN/_CATCH/_CATCH_ALL/_CATCH_END
#define GRAY_THROW                              throw   // throw reference (STL)
#define GRAY_TRY                                _TRY_BEGIN
#define GRAY_TRY_CATCH(c,ex)    _CATCH(c& ex)   // c=cExceptionBase
#define GRAY_TRY_CATCHALL               _CATCH_ALL
#define GRAY_TRY_END                    _CATCH_END
#else   // __linux__
#define GRAY_THROW                              throw   // throw reference (STL)
#define GRAY_TRY                                try {
#define GRAY_TRY_CATCH(c,ex)    } catch (c& ex) {       // c=cExceptionBase
#define GRAY_TRY_CATCHALL               } catch (...) {
#define GRAY_TRY_END                    }
#endif
 
};
 
#endif // _INC_cExceptionBase_H