#ifndef BOOST_MPL_AUX_NA_HPP_INCLUDED | |
#define BOOST_MPL_AUX_NA_HPP_INCLUDED | |
// Copyright Aleksey Gurtovoy 2001-2004 | |
// | |
// Distributed under the Boost Software License, Version 1.0. | |
// (See accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// | |
// See http://www.boost.org/libs/mpl for documentation. | |
// $Id: na.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#include <boost/mpl/bool.hpp> | |
#include <boost/mpl/aux_/na_fwd.hpp> | |
#include <boost/mpl/aux_/config/msvc.hpp> | |
#include <boost/mpl/aux_/config/ctps.hpp> | |
namespace boost { namespace mpl { | |
template< typename T > | |
struct is_na | |
: false_ | |
{ | |
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
using false_::value; | |
#endif | |
}; | |
template<> | |
struct is_na<na> | |
: true_ | |
{ | |
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
using true_::value; | |
#endif | |
}; | |
template< typename T > | |
struct is_not_na | |
: true_ | |
{ | |
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
using true_::value; | |
#endif | |
}; | |
template<> | |
struct is_not_na<na> | |
: false_ | |
{ | |
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
using false_::value; | |
#endif | |
}; | |
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
template< typename T, typename U > struct if_na | |
{ | |
typedef T type; | |
}; | |
template< typename U > struct if_na<na,U> | |
{ | |
typedef U type; | |
}; | |
#else | |
template< typename T > struct if_na_impl | |
{ | |
template< typename U > struct apply | |
{ | |
typedef T type; | |
}; | |
}; | |
template<> struct if_na_impl<na> | |
{ | |
template< typename U > struct apply | |
{ | |
typedef U type; | |
}; | |
}; | |
template< typename T, typename U > struct if_na | |
: if_na_impl<T>::template apply<U> | |
{ | |
}; | |
#endif | |
}} | |
#endif // BOOST_MPL_AUX_NA_HPP_INCLUDED |