mirror of https://github.com/PCSX2/pcsx2.git
85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
// SPDX-FileCopyrightText: 2002-2023 PCSX2 Dev Team
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// SPDX-License-Identifier: LGPL-3.0+
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#pragma once
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#include <type_traits>
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namespace detail
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{
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/// Marks an enum as supporting boolean operators
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template <typename T>
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struct enum_is_flags : public std::false_type {};
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/// For return types that should be convertible to bool
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template <typename Enum>
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struct enum_bool_helper
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{
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Enum value;
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constexpr enum_bool_helper(Enum value): value(value) {}
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constexpr operator Enum() const { return value; }
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constexpr operator bool() const { return static_cast<bool>(static_cast<typename std::underlying_type<Enum>::type>(value)); }
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};
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};
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#define MARK_ENUM_AS_FLAGS(T) template<> struct detail::enum_is_flags<T> : public std::true_type {}
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template <typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, Enum>::type
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operator|(Enum lhs, Enum rhs) noexcept
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{
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using underlying = typename std::underlying_type<Enum>::type;
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return static_cast<Enum>(static_cast<underlying>(lhs) | static_cast<underlying>(rhs));
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}
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template <typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, detail::enum_bool_helper<Enum>>::type
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operator&(Enum lhs, Enum rhs) noexcept
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{
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using underlying = typename std::underlying_type<Enum>::type;
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return static_cast<Enum>(static_cast<underlying>(lhs) & static_cast<underlying>(rhs));
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}
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template <typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, Enum>::type
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operator^(Enum lhs, Enum rhs) noexcept
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{
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using underlying = typename std::underlying_type<Enum>::type;
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return static_cast<Enum>(static_cast<underlying>(lhs) ^ static_cast<underlying>(rhs));
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}
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template <typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, Enum&>::type
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operator|=(Enum& lhs, Enum rhs) noexcept
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{
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return lhs = lhs | rhs;
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}
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template <typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, Enum&>::type
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operator&=(Enum& lhs, Enum rhs) noexcept
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{
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return lhs = lhs & rhs;
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}
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template <typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, Enum&>::type
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operator^=(Enum& lhs, Enum rhs) noexcept
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{
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return lhs = lhs ^ rhs;
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}
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template<typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, bool>::type
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operator!(Enum e) noexcept
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{
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return !static_cast<typename std::underlying_type<Enum>::type>(e);
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}
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template<typename Enum>
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constexpr typename std::enable_if<detail::enum_is_flags<Enum>::value, Enum>::type
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operator~(Enum e) noexcept
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{
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return static_cast<Enum>(~static_cast<typename std::underlying_type<Enum>::type>(e));
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}
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