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