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enum_ops.hpp
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80 lines (68 loc) · 1.89 KB
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#pragma once
#include <concepts>
#include <type_traits>
namespace m {
template<typename T>
requires std::is_enum_v<T> and
requires (std::underlying_type_t<T> x) {
{ x | x } -> std::same_as<std::underlying_type_t<T>>;
T(x);
}
constexpr T operator|(T left, T right)
{
using U = std::underlying_type_t<T>;
return T( U(left) | U(right) );
}
template<typename T>
requires std::is_enum_v<T> and
requires (std::underlying_type_t<T> x) {
{ x | x } -> std::same_as<std::underlying_type_t<T>>;
T(x);
}
constexpr T operator&(T left, T right)
{
using U = std::underlying_type_t<T>;
return T( U(left) & U(right) );
}
template<typename T>
requires std::is_enum_v<T> and
requires (std::underlying_type_t<T> x) {
{ ~x } -> std::same_as<std::underlying_type_t<T>>;
{ x & x } -> std::same_as<std::underlying_type_t<T>>;
T(x);
}
constexpr T operator-(T left, T right)
{
using U = std::underlying_type_t<T>;
return T( U(left) & ~U(right) );
}
template<typename T>
requires std::is_enum_v<T> and
requires (std::underlying_type_t<T> x) {
{ ~x } -> std::same_as<std::underlying_type_t<T>>;
T(x);
}
constexpr T operator~(T t)
{
using U = std::underlying_type_t<T>;
return T( ~U(t) );
}
template<typename T>
requires std::is_enum_v<T> and requires (T x) { { x | x } -> std::same_as<T>; }
constexpr T & operator|=(T &left, T right)
{
return left = left | right;
}
template<typename T>
requires std::is_enum_v<T> and requires (T x) { { x & x } -> std::same_as<T>; }
constexpr T & operator&=(T &left, T right)
{
return left = left & right;
}
template<typename T>
requires std::is_enum_v<T> and requires (T x) { { x - x } -> std::same_as<T>; }
constexpr T & operator-=(T &left, T right)
{
return left = left - right;
}
}