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193 lines
7.2 KiB
C++
193 lines
7.2 KiB
C++
// scoped_enum.hpp ---------------------------------------------------------//
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// Copyright Beman Dawes, 2009
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// Copyright (C) 2011-2012 Vicente J. Botet Escriba
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// Copyright (C) 2012 Anthony Williams
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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#ifndef BOOST_CORE_SCOPED_ENUM_HPP
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#define BOOST_CORE_SCOPED_ENUM_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost
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{
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#ifdef BOOST_NO_CXX11_SCOPED_ENUMS
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/**
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* Meta-function to get the native enum type associated to an enum class or its emulation.
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*/
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template <typename EnumType>
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struct native_type
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{
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/**
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* The member typedef type names the native enum type associated to the scoped enum,
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* which is it self if the compiler supports scoped enums or EnumType::enum_type if it is an emulated scoped enum.
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*/
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typedef typename EnumType::enum_type type;
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};
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/**
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* Casts a scoped enum to its underlying type.
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*
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* This function is useful when working with scoped enum classes, which doens't implicitly convert to the underlying type.
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* @param v A scoped enum.
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* @returns The underlying type.
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* @throws No-throws.
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*/
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template <typename UnderlyingType, typename EnumType>
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UnderlyingType underlying_cast(EnumType v)
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{
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return v.get_underlying_value_();
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}
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/**
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* Casts a scoped enum to its native enum type.
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*
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* This function is useful to make programs portable when the scoped enum emulation can not be use where native enums can.
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*
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* EnumType the scoped enum type
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*
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* @param v A scoped enum.
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* @returns The native enum value.
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* @throws No-throws.
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*/
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template <typename EnumType>
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inline
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typename EnumType::enum_type native_value(EnumType e)
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{
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return e.get_native_value_();
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}
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#else // BOOST_NO_CXX11_SCOPED_ENUMS
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template <typename EnumType>
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struct native_type
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{
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typedef EnumType type;
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};
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template <typename UnderlyingType, typename EnumType>
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UnderlyingType underlying_cast(EnumType v)
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{
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return static_cast<UnderlyingType>(v);
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}
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template <typename EnumType>
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inline
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EnumType native_value(EnumType e)
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{
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return e;
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}
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#endif // BOOST_NO_CXX11_SCOPED_ENUMS
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}
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#ifdef BOOST_NO_CXX11_SCOPED_ENUMS
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#ifndef BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
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#define BOOST_SCOPED_ENUM_UT_DECLARE_CONVERSION_OPERATOR \
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explicit operator underlying_type() const BOOST_NOEXCEPT { return get_underlying_value_(); }
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#else
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#define BOOST_SCOPED_ENUM_UT_DECLARE_CONVERSION_OPERATOR
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#endif
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/**
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* Start a declaration of a scoped enum.
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*
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* @param EnumType The new scoped enum.
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* @param UnderlyingType The underlying type.
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*/
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#define BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(EnumType, UnderlyingType) \
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struct EnumType { \
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typedef void is_boost_scoped_enum_tag; \
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typedef UnderlyingType underlying_type; \
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EnumType() BOOST_NOEXCEPT {} \
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explicit EnumType(underlying_type v) BOOST_NOEXCEPT : v_(v) {} \
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underlying_type get_underlying_value_() const BOOST_NOEXCEPT { return v_; } \
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BOOST_SCOPED_ENUM_UT_DECLARE_CONVERSION_OPERATOR \
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private: \
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underlying_type v_; \
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typedef EnumType self_type; \
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public: \
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enum enum_type
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#define BOOST_SCOPED_ENUM_DECLARE_END2() \
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enum_type get_native_value_() const BOOST_NOEXCEPT { return enum_type(v_); } \
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friend bool operator ==(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)==enum_type(rhs.v_); } \
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friend bool operator ==(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)==rhs; } \
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friend bool operator ==(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs==enum_type(rhs.v_); } \
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friend bool operator !=(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)!=enum_type(rhs.v_); } \
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friend bool operator !=(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)!=rhs; } \
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friend bool operator !=(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs!=enum_type(rhs.v_); } \
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friend bool operator <(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<enum_type(rhs.v_); } \
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friend bool operator <(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<rhs; } \
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friend bool operator <(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs<enum_type(rhs.v_); } \
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friend bool operator <=(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<=enum_type(rhs.v_); } \
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friend bool operator <=(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<=rhs; } \
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friend bool operator <=(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs<=enum_type(rhs.v_); } \
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friend bool operator >(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>enum_type(rhs.v_); } \
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friend bool operator >(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>rhs; } \
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friend bool operator >(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs>enum_type(rhs.v_); } \
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friend bool operator >=(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>=enum_type(rhs.v_); } \
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friend bool operator >=(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>=rhs; } \
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friend bool operator >=(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs>=enum_type(rhs.v_); } \
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};
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#define BOOST_SCOPED_ENUM_DECLARE_END(EnumType) \
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; \
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EnumType(enum_type v) BOOST_NOEXCEPT : v_(v) {} \
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BOOST_SCOPED_ENUM_DECLARE_END2()
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/**
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* Starts a declaration of a scoped enum with the default int underlying type.
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*
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* @param EnumType The new scoped enum.
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*/
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#define BOOST_SCOPED_ENUM_DECLARE_BEGIN(EnumType) \
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BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(EnumType,int)
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/**
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* Name of the native enum type.
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*
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* @param EnumType The new scoped enum.
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*/
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#define BOOST_SCOPED_ENUM_NATIVE(EnumType) EnumType::enum_type
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/**
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* Forward declares an scoped enum.
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*
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* @param EnumType The scoped enum.
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*/
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#define BOOST_SCOPED_ENUM_FORWARD_DECLARE(EnumType) struct EnumType
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#else // BOOST_NO_CXX11_SCOPED_ENUMS
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#define BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(EnumType,UnderlyingType) enum class EnumType : UnderlyingType
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#define BOOST_SCOPED_ENUM_DECLARE_BEGIN(EnumType) enum class EnumType
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#define BOOST_SCOPED_ENUM_DECLARE_END2()
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#define BOOST_SCOPED_ENUM_DECLARE_END(EnumType) ;
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#define BOOST_SCOPED_ENUM_NATIVE(EnumType) EnumType
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#define BOOST_SCOPED_ENUM_FORWARD_DECLARE(EnumType) enum class EnumType
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#endif // BOOST_NO_CXX11_SCOPED_ENUMS
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// Deprecated macros
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#define BOOST_SCOPED_ENUM_START(name) BOOST_SCOPED_ENUM_DECLARE_BEGIN(name)
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#define BOOST_SCOPED_ENUM_END BOOST_SCOPED_ENUM_DECLARE_END2()
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#define BOOST_SCOPED_ENUM(name) BOOST_SCOPED_ENUM_NATIVE(name)
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#endif // BOOST_CORE_SCOPED_ENUM_HPP
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