75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
// Copyright (C) 2017 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Core module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#pragma once
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#ifndef NAZARA_FLAGS_HPP
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#define NAZARA_FLAGS_HPP
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#include <Nazara/Prerequesites.hpp>
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#include <type_traits>
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namespace Nz
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{
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// From: https://www.justsoftwaresolutions.co.uk/cplusplus/using-enum-classes-as-bitfields.html
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template<typename E>
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struct EnumAsFlags
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{
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static constexpr bool value = false;
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static constexpr int max = 0;
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};
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template<typename E>
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class Flags
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{
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static_assert(std::is_enum<E>::value, "Type must be an enumeration");
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static_assert(EnumAsFlags<E>::value, "Enum has not been enabled as flags by an EnumAsFlags specialization");
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public:
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using BitField = typename std::conditional<(EnumAsFlags<E>::max > 32), UInt64, UInt32>::type;
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constexpr Flags(BitField value = 0);
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constexpr Flags(E enumVal);
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explicit constexpr operator bool() const;
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explicit constexpr operator BitField() const;
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constexpr Flags operator~() const;
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constexpr Flags operator&(const Flags& rhs) const;
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constexpr Flags operator|(const Flags& rhs) const;
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constexpr Flags operator^(const Flags& rhs) const;
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constexpr bool operator==(const Flags& rhs) const;
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constexpr bool operator!=(const Flags& rhs) const;
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/*constexpr*/ Flags& operator|=(const Flags& rhs);
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/*constexpr*/ Flags& operator&=(const Flags& rhs);
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/*constexpr*/ Flags& operator^=(const Flags& rhs);
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static constexpr BitField GetFlagValue(E enumValue);
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static constexpr BitField ValueMask = ((BitField(1) << (EnumAsFlags<E>::max + 1)) - 1);
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private:
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BitField m_value;
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};
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// Little hack to have them in both Nz and global scope
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namespace FlagsOperators
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{
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template<typename E> constexpr std::enable_if_t<EnumAsFlags<E>::value, Flags<E>> operator~(E lhs);
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template<typename E> constexpr std::enable_if_t<EnumAsFlags<E>::value, Flags<E>> operator|(E lhs, E rhs);
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template<typename E> constexpr std::enable_if_t<EnumAsFlags<E>::value, Flags<E>> operator&(E lhs, E rhs);
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template<typename E> constexpr std::enable_if_t<EnumAsFlags<E>::value, Flags<E>> operator^(E lhs, E rhs);
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}
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using namespace FlagsOperators;
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}
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using namespace Nz::FlagsOperators;
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#include <Nazara/Core/Flags.inl>
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#endif // NAZARA_FLAGS_HPP
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