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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 |