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Add basic bitflag-enum operator relaxation utilities.

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This commit is contained in:
Jason Volk 2016-08-22 15:48:02 -07:00
parent dd9124b687
commit 3847a3e30a
1 changed files with 82 additions and 0 deletions
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82
include/ircd/util.h
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@ -112,6 +112,88 @@ auto lex_cast(Args&&... args)
#endif
/**
* flag-enum utilities
*
* This relaxes the strong typing of enums to allow bitflags with operations on the elements
* with intuitive behavior.
*
* If the project desires absolute guarantees on the strong enum typing then this can be tucked
* away in some namespace and imported into select scopes instead.
*/
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
operator~(const Enum &a)
{
using enum_t = typename std::underlying_type<Enum>::type;
return static_cast<Enum>(~static_cast<enum_t>(a));
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, bool>::type
operator!(const Enum &a)
{
using enum_t = typename std::underlying_type<Enum>::type;
return !static_cast<enum_t>(a);
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
operator|(const Enum &a, const Enum &b)
{
using enum_t = typename std::underlying_type<Enum>::type;
return static_cast<Enum>(static_cast<enum_t>(a) | static_cast<enum_t>(b));
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
operator&(const Enum &a, const Enum &b)
{
using enum_t = typename std::underlying_type<Enum>::type;
return static_cast<Enum>(static_cast<enum_t>(a) & static_cast<enum_t>(b));
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
operator^(const Enum &a, const Enum &b)
{
using enum_t = typename std::underlying_type<Enum>::type;
return static_cast<Enum>(static_cast<enum_t>(a) ^ static_cast<enum_t>(b));
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, Enum &>::type
operator|=(Enum &a, const Enum &b)
{
using enum_t = typename std::underlying_type<Enum>::type;
return (a = (a | b));
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, Enum &>::type
operator&=(Enum &a, const Enum &b)
{
using enum_t = typename std::underlying_type<Enum>::type;
return (a = (a & b));
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, Enum &>::type
operator^=(Enum &a, const Enum &b)
{
using enum_t = typename std::underlying_type<Enum>::type;
return (a = (a ^ b));
}
} // namespace util
} // namespace ircd
#endif // __cplusplus