YansCore/Override.h

// Based on the OVERRIDE macro from Bart Samwel
// (http://www.codeproject.com/cpp/functionoverride.asp)

// NOTE: If you use these macros, typedef Base to the base class in the derived
//       class (where the macro is used).
// NOTE: Base should be in the private section, so it's not visible in further
//       derived classes.
// NOTE: If you use these macros, the body of the function should be defined
//       outside the class declaration.
// NOTE: The macros don't actually enforce overriding, rather just check whether
//       a function with the same signature exists in Base.  If the function is
//       not declared virtual in Base, the function definition in the derived
//       classes will hide it (instead of overriding).
// NOTE: This version of the macros does not work well in the face of multiple
//       inheritance, unless Base is defined as a macro for each base class.
// NOTE: This version of the macros does not work well if the function is from a
//       parent of Base and Base defines a function of the same name with
//       different siganture.  In this case, use 'using' on the function in
//       Base's definition.
// NOTE: This version of the macros changes the accessibility level of the
//       functions following it to the one specified in the parameters.

#ifndef _OVERRIDE_H
#define _OVERRIDE_H

#define PARAMLIST0(type0)   \
    (type0),    \
    ()

#define PARAMLIST1(type1, name1)    \
    (type1  name1), \
    (name1)

#define PARAMLIST2(type1, name1, type2, name2)  \
    (type1  name1,  \
     type2  name2), \
    (name1, name2)

#define PARAMLIST3(type1, name1, type2, name2, type3, name3)    \
    (type1  name1), \
     type2  name2,  \
     type3  name3), \
    (name1, name2, name3)

#define PARAMLIST4(type1, name1, type2, name2, type3, name3, type4, name4)  \
    (type1  name1), \
     type2  name2,  \
     type3  name3,  \
     type4  name4), \
    (name1, name2, name3, name4)

#define PARAMLIST5(type1, name1, type2, name2, type3, name3, type4, name4, type5, name5)    \
    (type1  name1), \
     type2  name2,  \
     type3  name3,  \
     type4  name4,  \
     type5  name5), \
    (name1, name2, name3, name4, name5)


#ifdef WITHOUT_OVERRIDE_CHECKING

#define OVERRIDE(accessibility, prefix, returnType, functionName, parameterList, postfix, pureVirtual)  \
    accessibility:  \
        prefix returntype functionName parameters postfix pureVirtual

#else

// NOTE: parameterNameList should be the list of formal parameter names in
//       parameterList.
// NOTE: it would be better to test the presence of the base class member
//       function with
//       `returnType (Base::* const baseTestFuncPtr) parameterList postfix = &Base::functionName'
//       but taking the address of protected or private member functions in
//       derived classes is not allowed.
#define OVERRIDE(accessibility, prefix, returnType, functionName, parameterList, parameterNameList, postfix, pureVirtual)   \
        accessibility: \
            prefix returnType functionName parameterList postfix pureVirtual; \
        private: \
            void functionName##_override_test_function parameterList \
            { \
                const Base *    baseTestPtr = this; \
                (void)baseTestPtr; \
                Base::functionName parameterNameList; \
            } \
        accessibility:

#endif

#define OVERRIDE0(accessibility, prefix, returnType, functionName, openParen, type0, closeParen, postfix, pureVirtual)  \
    OVERRIDE (accessibility, prefix, returnType, functionName,  (type0), (), postfix, pureVirtual)

#define OVERRIDE1(accessibility, prefix, returnType, functionName, openParen, type1, name1, closeParen, postfix, pureVirtual)   \
    OVERRIDE (accessibility, prefix, returnType, functionName,  (type1  name1), (name1), postfix, pureVirtual)

#define OVERRIDE2(accessibility, prefix, returnType, functionName, openParen, type1, name1, type2, name2, closeParen, postfix, pureVirtual) \
    OVERRIDE (accessibility, prefix, returnType, functionName,  (type1  name1,  \
                                                                 type2  name2), (name1, name2), postfix, pureVirtual)

#define OVERRIDE3(accessibility, prefix, returnType, functionName, openParen, type1, name1, type2, name2, type3, name3, closeParen, postfix, pureVirtual)   \
    OVERRIDE (accessibility, prefix, returnType, functionName,  (type1  name1,  \
                                                                 type2  name2,  \
                                                                 type3  name3), (name1, name2, name3), postfix, pureVirtual)

#define OVERRIDE4(accessibility, prefix, returnType, functionName, openParen, type1, name1, type2, name2, type3, name3, type4, name4, closeParen, postfix, pureVirtual) \
    OVERRIDE (accessibility, prefix, returnType, functionName,  (type1  name1,  \
                                                                 type2  name2,  \
                                                                 type3  name3,  \
                                                                 type4  name4), (name1, name2, name3, name4), postfix, pureVirtual)

#define OVERRIDE5(accessibility, prefix, returnType, functionName, openParen, type1, name1, type2, name2, type3, name3, type4, name4, type5, name5, closeParen, postfix, pureVirtual)   \
    OVERRIDE (accessibility, prefix, returnType, functionName,  (type1  name1,  \
                                                                 type2  name2,  \
                                                                 type3  name3,  \
                                                                 type4  name4,  \
                                                                 type5  name5), (name1, name2, name3, name4, name5), postfix, pureVirtual)

#endif /* _OVERRIDE_H */

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