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// underlying_type.hpp ---------------------------------------------------------//
// Copyright Beman Dawes, 2009
// Copyright (C) 2011-2012 Vicente J. Botet Escriba
// Copyright (C) 2012 Anthony Williams
// Copyright (C) 2014 Andrey Semashev
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_CORE_UNDERLYING_TYPE_HPP
#define BOOST_CORE_UNDERLYING_TYPE_HPP
#include <boost/config.hpp>
// GCC 4.7 and later seem to provide std::underlying_type
#if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS) || (defined(BOOST_GCC) && BOOST_GCC >= 40700 && defined(__GXX_EXPERIMENTAL_CXX0X__))
#include <type_traits>
#define BOOST_DETAIL_HAS_STD_UNDERLYING_TYPE
#endif
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
namespace detail {
template< typename EnumType, typename Void = void >
struct underlying_type_impl;
#if defined(BOOST_NO_CXX11_SCOPED_ENUMS)
// Support for boost/core/scoped_enum.hpp
template< typename EnumType >
struct underlying_type_impl< EnumType, typename EnumType::is_boost_scoped_enum_tag >
{
/**
* The member typedef type names the underlying type of EnumType. It is EnumType::underlying_type when the EnumType is an emulated scoped enum,
*/
typedef typename EnumType::underlying_type type;
};
#endif
#if defined(BOOST_DETAIL_HAS_STD_UNDERLYING_TYPE)
template< typename EnumType, typename Void >
struct underlying_type_impl
{
typedef typename std::underlying_type< EnumType >::type type;
};
#endif
} // namespace detail
#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS) && !defined(BOOST_DETAIL_HAS_STD_UNDERLYING_TYPE)
#define BOOST_NO_UNDERLYING_TYPE
#endif
/**
* Meta-function to get the underlying type of a scoped enum.
*
* Requires EnumType must be an enum type or the emulation of a scoped enum.
* If BOOST_NO_UNDERLYING_TYPE is defined, the implementation will not be able
* to deduce the underlying type of enums. The user is expected to specialize
* this trait in this case.
*/
template< typename EnumType >
struct underlying_type :
public detail::underlying_type_impl< EnumType >
{
};
} // namespace boost
#endif // BOOST_CORE_UNDERLYING_TYPE_HPP
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