mirror of
https://github.com/libretro/pcsx2.git
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97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2022 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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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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