Core: Add Flags class

include/Nazara/Core/Flags.hpp

@@ -0,0 +1,59 @@
+// Copyright (C) 2016 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_FLAGS_HPP
+#define NAZARA_FLAGS_HPP
+
+#include <Nazara/Prerequesites.hpp>
+#include <type_traits>
+
+namespace Nz
+{
+	template<typename E>
+	class Flags
+	{
+		static_assert(std::is_enum<E>::value, "Type must be an enumeration");
+
+		public:
+			constexpr Flags(UInt32 value);
+			constexpr Flags(E enumVal);
+
+			explicit constexpr operator bool() const;
+
+			constexpr Flags operator~() const;
+			constexpr Flags operator&(Flags rhs) const;
+			constexpr Flags operator|(Flags rhs) const;
+			constexpr Flags operator^(Flags rhs) const;
+
+			constexpr bool operator==(Flags rhs) const;
+			constexpr bool operator!=(Flags rhs) const;
+
+			/*constexpr*/ Flags& operator|=(Flags rhs);
+			/*constexpr*/ Flags& operator&=(Flags rhs);
+			/*constexpr*/ Flags& operator^=(Flags rhs);
+
+			static constexpr UInt32 GetFlagValue(E enumValue);
+
+		private:
+			UInt32 m_value;
+	};
+
+	// From: https://www.justsoftwaresolutions.co.uk/cplusplus/using-enum-classes-as-bitfields.html
+	template<typename E>
+	struct EnableFlagsOperators
+	{
+		static constexpr bool value = false;
+	};
+
+	template<typename E> constexpr std::enable_if_t<EnableFlagsOperators<E>::value, Flags<E>> operator~(E lhs);
+	template<typename E> constexpr std::enable_if_t<EnableFlagsOperators<E>::value, Flags<E>> operator|(E lhs, E rhs);
+	template<typename E> constexpr std::enable_if_t<EnableFlagsOperators<E>::value, Flags<E>> operator&(E lhs, E rhs);
+	template<typename E> constexpr std::enable_if_t<EnableFlagsOperators<E>::value, Flags<E>> operator^(E lhs, E rhs);
+}
+
+#include <Nazara/Core/Flags.inl>
+
+#endif // NAZARA_FLAGS_HPP