BitwiseEnum.h

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#pragma once
#include "Casting.h"
 
#define MAKE_BITWISE_ENUM(ENUM_TYPE) \
    /* Returns the result of bitwise-ORing \a lhs and \a rhs. */ \
    constexpr ENUM_TYPE operator|(ENUM_TYPE lhs, ENUM_TYPE rhs) { \
        return static_cast<ENUM_TYPE>(utils::to_underlying_type(lhs) | utils::to_underlying_type(rhs)); \
    } \
    \
    /* Bitwise-ORs \a lhs and \a rhs and assigns the result to \a lhs. */ \
    constexpr ENUM_TYPE& operator|=(ENUM_TYPE& lhs, ENUM_TYPE rhs) { \
        return lhs = lhs | rhs; \
    } \
    \
    /* Returns \c true if all bits in \a testedFlag are also set in \a value. */ \
    constexpr bool HasFlag(ENUM_TYPE testedFlag, ENUM_TYPE value) { \
        return utils::to_underlying_type(testedFlag) == (utils::to_underlying_type(testedFlag) & utils::to_underlying_type(value)); \
    } \
    /* Returns true if \a value has exactly one bit set. */ \
    constexpr bool HasSingleFlag(ENUM_TYPE value) { \
        return utils::to_underlying_type(value) && !(utils::to_underlying_type(value) & (utils::to_underlying_type(value) - 1)); \
    }