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