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Diffstat (limited to 'src/third_party/boost-1.60.0/boost/mpl/aux_/na.hpp')
-rw-r--r-- | src/third_party/boost-1.60.0/boost/mpl/aux_/na.hpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/third_party/boost-1.60.0/boost/mpl/aux_/na.hpp b/src/third_party/boost-1.60.0/boost/mpl/aux_/na.hpp new file mode 100644 index 00000000000..f079c1e78cd --- /dev/null +++ b/src/third_party/boost-1.60.0/boost/mpl/aux_/na.hpp @@ -0,0 +1,95 @@ + +#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. + +// $Id$ +// $Date$ +// $Revision$ + +#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 |