96 lines
1.7 KiB
C++
96 lines
1.7 KiB
C++
|
|
#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: 2008-10-10 23:19:02 -0700 (Fri, 10 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
|