// Copyright 2005 Alexander Nasonov.

// 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)

#ifndef FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED

#define FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED

#include <boost/config.hpp>

#ifdef BOOST_NO_CV_SPECIALIZATIONS

#include <boost/mpl/at.hpp>

#include <boost/mpl/int.hpp>

#include <boost/mpl/multiplies.hpp>

#include <boost/mpl/plus.hpp>

#include <boost/mpl/vector.hpp>

#include <boost/type_traits/is_same.hpp>

#endif

// Should be the last #include

#include <boost/type_traits/detail/type_trait_def.hpp>

namespace boost {

namespace type_traits { namespace detail {

#ifndef BOOST_NO_CV_SPECIALIZATIONS

template<class T>

struct floating_point_promotion

{

    typedef T type;

};

template<>

struct floating_point_promotion<float>

{

    typedef double type;

};

template<>

struct floating_point_promotion<float const>

{

    typedef double const type;

};

template<>

struct floating_point_promotion<float volatile>

{

    typedef double volatile type;

};

template<>

struct floating_point_promotion<float const volatile>

{

    typedef double const volatile type;

};

#else

template<class T>

struct floating_point_promotion

  : mpl::at<

        mpl::vector< T, double, double const, double volatile,

                     double const volatile >

      , mpl::plus<

            is_same<T, float>

          , mpl::multiplies< is_same<T, float const>         , mpl::int_<2> >

          , mpl::multiplies< is_same<T, float volatile>      , mpl::int_<3> >

          , mpl::multiplies< is_same<T, float const volatile>, mpl::int_<4> >

          >

      >

{

};

#endif

} }

BOOST_TT_AUX_TYPE_TRAIT_DEF1(

      floating_point_promotion

    , T

    , BOOST_DEDUCED_TYPENAME

        boost::type_traits::detail::floating_point_promotion<T>::type

    )

}

#include <boost/type_traits/detail/type_trait_undef.hpp>

#endif // #ifndef FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED