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#pragma once
#include <functional>
namespace cru {
template <typename Tag, typename TUnderlying = unsigned>
struct Bitmask final {
using Underlying = TUnderlying;
constexpr Bitmask() : value(0) {}
constexpr explicit Bitmask(TUnderlying value) : value(value) {}
static constexpr Bitmask FromOffset(int offset) {
return Bitmask(static_cast<TUnderlying>(1u << offset));
}
constexpr bool Has(Bitmask rhs) const { return (value & rhs.value) != 0; }
Bitmask operator|(Bitmask rhs) const { return Bitmask(value | rhs.value); }
Bitmask operator&(Bitmask rhs) const { return Bitmask(value & rhs.value); }
Bitmask operator^(Bitmask rhs) const { return Bitmask(value ^ rhs.value); }
Bitmask operator~() const { return Bitmask(~value); }
Bitmask& operator|=(Bitmask rhs) {
value |= rhs.value;
return *this;
}
Bitmask& operator&=(Bitmask rhs) {
value &= rhs.value;
return *this;
}
Bitmask& operator^=(Bitmask rhs) {
value ^= rhs.value;
return *this;
}
bool operator==(Bitmask rhs) const { return this->value == rhs.value; }
bool operator!=(Bitmask rhs) const { return this->value != rhs.value; }
explicit operator TUnderlying() const { return value; }
operator bool() const { return value != 0; }
TUnderlying value;
};
} // namespace cru
namespace std {
template <typename Tag, typename TUnderlying>
struct hash<cru::Bitmask<Tag, TUnderlying>> {
using Bitmask = cru::Bitmask<Tag, TUnderlying>;
std::size_t operator()(Bitmask bitmask) const {
return std::hash<TUnderlying>{}(bitmask.value);
}
};
} // namespace std
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