Chris@16: //  (C) Copyright John Maddock 2005.
Chris@16: //  Use, modification and distribution are subject to the
Chris@16: //  Boost Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_TR1_MATH_OVERLOADS_HPP_INCLUDED
Chris@16: #  define BOOST_TR1_MATH_OVERLOADS_HPP_INCLUDED
Chris@16: #  include <boost/config.hpp>
Chris@16: 
Chris@16: #  ifndef BOOST_NO_SFINAE
Chris@16: #     include <boost/utility/enable_if.hpp>
Chris@16: #     include <boost/type_traits/is_convertible.hpp>
Chris@16: #     define BOOST_TR1_MATH_RETURN(RET) typename ::boost::enable_if< ::boost::is_convertible<T,double>, RET >::type
Chris@16: #  else
Chris@16: #     define BOOST_TR1_MATH_RETURN(RET) RET
Chris@16: #  endif
Chris@16: 
Chris@16: #  include <boost/type_traits/is_floating_point.hpp>
Chris@16: #  include <boost/type_traits/is_same.hpp>
Chris@16: #  include <boost/mpl/if.hpp>
Chris@16: 
Chris@16: namespace boost{ namespace tr1_detail{
Chris@16: 
Chris@16: template <class T, class U>
Chris@16: struct largest_real
Chris@16: {
Chris@16:    typedef typename boost::mpl::if_<
Chris@16:       boost::is_same<long double, T>,
Chris@16:       long double,
Chris@16:       typename boost::mpl::if_<
Chris@16:          boost::is_same<long double, U>,
Chris@16:          long double,
Chris@16:          typename boost::mpl::if_<
Chris@16:             boost::is_same<double, T>,
Chris@16:             double,
Chris@16:             typename boost::mpl::if_<
Chris@16:                boost::is_same<double, U>,
Chris@16:                double,
Chris@16:                float
Chris@16:             >::type
Chris@16:          >::type
Chris@16:       >::type
Chris@16:    >::type type;
Chris@16: };
Chris@16: 
Chris@16: template <class T, class U>
Chris@16: struct promote_to_real
Chris@16: {
Chris@16:    typedef typename largest_real<
Chris@16:       typename boost::mpl::if_< boost::is_floating_point<T>, T, double>::type,
Chris@16:       typename boost::mpl::if_< boost::is_floating_point<U>, U, double>::type
Chris@16:    >::type type;
Chris@16: };
Chris@16: 
Chris@16: } }
Chris@16: 
Chris@16: #endif
Chris@16: