//  (C) Copyright John Maddock 2005.

//  Use, modification and distribution are subject to 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 BOOST_TR1_MATH_OVERLOADS_HPP_INCLUDED

#  define BOOST_TR1_MATH_OVERLOADS_HPP_INCLUDED

#  include <boost/config.hpp>

#  ifndef BOOST_NO_SFINAE

#     include <boost/utility/enable_if.hpp>

#     include <boost/type_traits/is_convertible.hpp>

#     define BOOST_TR1_MATH_RETURN(RET) typename ::boost::enable_if< ::boost::is_convertible<T,double>, RET >::type

#  else

#     define BOOST_TR1_MATH_RETURN(RET) RET

#  endif

#  include <boost/type_traits/is_floating_point.hpp>

#  include <boost/type_traits/is_same.hpp>

#  include <boost/mpl/if.hpp>

namespace boost{ namespace tr1_detail{

template <class T, class U>

struct largest_real

{

   typedef typename boost::mpl::if_<

      boost::is_same<long double, T>,

      long double,

      typename boost::mpl::if_<

         boost::is_same<long double, U>,

         long double,

         typename boost::mpl::if_<

            boost::is_same<double, T>,

            double,

            typename boost::mpl::if_<

               boost::is_same<double, U>,

               double,

               float

            >::type

         >::type

      >::type

   >::type type;

};

template <class T, class U>

struct promote_to_real

{

   typedef typename largest_real<

      typename boost::mpl::if_< boost::is_floating_point<T>, T, double>::type,

      typename boost::mpl::if_< boost::is_floating_point<U>, U, double>::type

   >::type type;

};

} }

#endif