| 1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
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| 2 | |
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| 3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. |
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| 4 | // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. |
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| 5 | // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. |
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| 6 | |
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| 7 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library |
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| 8 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. |
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| 9 | |
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| 10 | // Use, modification and distribution is subject to the Boost Software License, |
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| 11 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 12 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 13 | |
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| 14 | #ifndef BOOST_GEOMETRY_UTIL_PROMOTE_FLOATING_POINT_HPP |
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| 15 | #define BOOST_GEOMETRY_UTIL_PROMOTE_FLOATING_POINT_HPP |
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| 16 | |
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| 17 | |
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| 18 | #include <boost/mpl/if.hpp> |
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| 19 | #include <boost/type_traits.hpp> |
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| 20 | |
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| 21 | |
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| 22 | namespace boost { namespace geometry |
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| 23 | { |
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| 24 | |
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| 25 | |
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| 26 | /*! |
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| 27 | \brief Meta-function converting, if necessary, to "a floating point" type |
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| 28 | \details |
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| 29 | - if input type is integer, type is double |
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| 30 | - else type is input type |
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| 31 | \ingroup utility |
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| 32 | */ |
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| 33 | |
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| 34 | template <typename T, typename PromoteIntegerTo = double> |
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| 35 | struct promote_floating_point |
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| 36 | { |
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| 37 | typedef typename |
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| 38 | boost::mpl::if_ |
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| 39 | < |
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| 40 | boost::is_integral<T>, |
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| 41 | PromoteIntegerTo, |
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| 42 | T |
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| 43 | >::type type; |
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| 44 | }; |
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| 45 | |
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| 46 | |
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| 47 | }} // namespace boost::geometry |
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| 48 | |
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| 49 | |
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| 50 | #endif // BOOST_GEOMETRY_UTIL_PROMOTE_FLOATING_POINT_HPP |
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| 51 | |
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