| 1 | // (C) Copyright John Maddock 2005. |
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| 2 | // Use, modification and distribution are subject to the |
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| 3 | // Boost Software License, Version 1.0. (See accompanying file |
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| 4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | #ifndef BOOST_TR1_MATH_OVERLOADS_HPP_INCLUDED |
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| 7 | # define BOOST_TR1_MATH_OVERLOADS_HPP_INCLUDED |
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| 8 | # include <boost/config.hpp> |
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| 9 | |
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| 10 | # ifndef BOOST_NO_SFINAE |
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| 11 | # include <boost/utility/enable_if.hpp> |
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| 12 | # include <boost/type_traits/is_convertible.hpp> |
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| 13 | # define BOOST_TR1_MATH_RETURN(RET) typename ::boost::enable_if< ::boost::is_convertible<T,double>, RET >::type |
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| 14 | # else |
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| 15 | # define BOOST_TR1_MATH_RETURN(RET) RET |
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| 16 | # endif |
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| 17 | |
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| 18 | # include <boost/type_traits/is_floating_point.hpp> |
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| 19 | # include <boost/type_traits/is_same.hpp> |
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| 20 | # include <boost/mpl/if.hpp> |
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| 21 | |
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| 22 | namespace boost{ namespace tr1_detail{ |
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| 23 | |
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| 24 | template <class T, class U> |
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| 25 | struct largest_real |
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| 26 | { |
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| 27 | typedef typename boost::mpl::if_< |
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| 28 | boost::is_same<long double, T>, |
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| 29 | long double, |
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| 30 | typename boost::mpl::if_< |
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| 31 | boost::is_same<long double, U>, |
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| 32 | long double, |
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| 33 | typename boost::mpl::if_< |
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| 34 | boost::is_same<double, T>, |
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| 35 | double, |
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| 36 | typename boost::mpl::if_< |
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| 37 | boost::is_same<double, U>, |
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| 38 | double, |
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| 39 | float |
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| 40 | >::type |
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| 41 | >::type |
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| 42 | >::type |
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| 43 | >::type type; |
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| 44 | }; |
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| 45 | |
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| 46 | template <class T, class U> |
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| 47 | struct promote_to_real |
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| 48 | { |
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| 49 | typedef typename largest_real< |
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| 50 | typename boost::mpl::if_< boost::is_floating_point<T>, T, double>::type, |
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| 51 | typename boost::mpl::if_< boost::is_floating_point<U>, U, double>::type |
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| 52 | >::type type; |
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| 53 | }; |
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| 54 | |
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| 55 | } } |
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| 56 | |
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| 57 | #endif |
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| 58 | |
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