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better enum increment/decrement operators:

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* deduce underlying type rather than assuming int
* return old value from post-increment/decrement
* return reference from pre-increment/decrement
This commit is contained in:
Vas Crabb 2016-07-11 23:18:16 +10:00
parent b371656296
commit 066dab4bde
1 changed files with 8 additions and 9 deletions
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17
src/emu/emucore.h
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@ -190,17 +190,16 @@ const endianness_t ENDIANNESS_NATIVE = ENDIANNESS_BIG;
//**************************************************************************
// macro for defining a copy constructor and assignment operator to prevent copying
#define DISABLE_COPYING(_Type) \
private: \
_Type(const _Type &) = delete; \
_Type &operator=(const _Type &) = delete
#define DISABLE_COPYING(TYPE) \
TYPE(const TYPE &) = delete; \
TYPE &operator=(const TYPE &) = delete
// macro for declaring enumerator operators that increment/decrement like plain old C
#define DECLARE_ENUM_OPERATORS(_Type) \
inline void operator++(_Type &value) { value = (_Type)((int)value + 1); } \
inline void operator++(_Type &value, int) { value = (_Type)((int)value + 1); } \
inline void operator--(_Type &value) { value = (_Type)((int)value - 1); } \
inline void operator--(_Type &value, int) { value = (_Type)((int)value - 1); }
#define DECLARE_ENUM_OPERATORS(TYPE) \
inline TYPE &operator++(TYPE &value) { return value = TYPE(std::underlying_type_t<TYPE>(value) + 1); } \
inline TYPE operator++(TYPE &value, int) { TYPE const old(value); ++value; return old; } \
inline TYPE &operator--(TYPE &value) { return value = TYPE(std::underlying_type_t<TYPE>(value) - 1); } \
inline TYPE operator--(TYPE &value, int) { TYPE const old(value); --value; return old; }
// this macro passes an item followed by a string version of itself as two consecutive parameters