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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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