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135 lines
3.9 KiB
C++
135 lines
3.9 KiB
C++
#pragma once
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#include <type_traits>
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// enum flag helpers
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template<typename TEnum>
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struct EnableBitMaskOperators
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{
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static const bool enable = false;
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};
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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TEnum operator &(TEnum lhs, TEnum rhs)
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{
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return static_cast<TEnum> (static_cast<typename std::underlying_type<TEnum>::type>(lhs) & static_cast<typename std::underlying_type<TEnum>::type>(rhs));
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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TEnum operator |(TEnum lhs, TEnum rhs)
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{
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return static_cast<TEnum> (static_cast<typename std::underlying_type<TEnum>::type>(lhs) | static_cast<typename std::underlying_type<TEnum>::type>(rhs));
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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TEnum operator ^(TEnum lhs, TEnum rhs)
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{
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return static_cast<TEnum> (static_cast<typename std::underlying_type<TEnum>::type>(lhs) ^ static_cast<typename std::underlying_type<TEnum>::type>(rhs));
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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TEnum operator ~(TEnum rhs)
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{
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return static_cast<TEnum> (~static_cast<typename std::underlying_type<TEnum>::type>(rhs));
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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TEnum& operator &=(TEnum& lhs, TEnum rhs)
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{
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lhs = static_cast<TEnum> (static_cast<typename std::underlying_type<TEnum>::type>(lhs) & static_cast<typename std::underlying_type<TEnum>::type>(rhs));
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return lhs;
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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TEnum& operator |=(TEnum& lhs, TEnum rhs)
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{
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lhs = static_cast<TEnum> (static_cast<typename std::underlying_type<TEnum>::type>(lhs) | static_cast<typename std::underlying_type<TEnum>::type>(rhs));
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return lhs;
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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TEnum& operator ^=(TEnum& lhs, TEnum rhs)
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{
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lhs = static_cast<TEnum> (static_cast<typename std::underlying_type<TEnum>::type>(lhs) ^ static_cast<typename std::underlying_type<TEnum>::type>(rhs));
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return lhs;
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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constexpr bool operator==(TEnum lhs, std::underlying_type_t<TEnum> rhs)
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{
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return static_cast<std::underlying_type_t<TEnum>>(lhs) == rhs;
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}
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template<typename TEnum>
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requires EnableBitMaskOperators<TEnum>::enable
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constexpr bool operator!=(TEnum lhs, std::underlying_type_t<TEnum> rhs)
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{
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return static_cast<std::underlying_type_t<TEnum>>(lhs) != rhs;
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}
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#define ENABLE_BITMASK_OPERATORS(x) template<> struct EnableBitMaskOperators<x> { static const bool enable = true; };
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template<typename TEnum>
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struct EnableEnumIterators
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{
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static const bool enable = false;
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};
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template<typename TEnum>
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requires EnableEnumIterators<TEnum>::enable
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TEnum& operator++(TEnum& lhs)
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{
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lhs = static_cast<TEnum>(static_cast<typename std::underlying_type<TEnum>::type>(lhs) + 1);
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return lhs;
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}
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template<typename TEnum>
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requires EnableEnumIterators<TEnum>::enable
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TEnum operator*(TEnum rhs)
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{
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return rhs;
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}
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template<typename TEnum>
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requires EnableEnumIterators<TEnum>::enable
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TEnum begin(TEnum value)
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{
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return EnableEnumIterators<TEnum>::begin;
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}
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template<typename TEnum>
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requires EnableEnumIterators<TEnum>::enable
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TEnum rbegin(TEnum value)
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{
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return EnableEnumIterators<TEnum>::rbegin;
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}
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template<typename TEnum>
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requires EnableEnumIterators<TEnum>::enable
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TEnum end(TEnum r) {
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return EnableEnumIterators<TEnum>::end;
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}
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template<typename TEnum>
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requires EnableEnumIterators<TEnum>::enable
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TEnum rend(TEnum r) {
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return EnableEnumIterators<TEnum>::rend;
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}
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#define ENABLE_ENUM_ITERATORS(x, first_value, last_value) template<> struct EnableEnumIterators<x> {\
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static const bool enable = true;\
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static const x begin = first_value;\
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static const x rbegin = last_value;\
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static const x end = static_cast<x>(static_cast<typename std::underlying_type<x>::type>(last_value) + 1);\
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static const x rend = static_cast<x>(static_cast<typename std::underlying_type<x>::type>(first_value) - 1);\
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};
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// todo: rend type must be signed?
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