ceph/src/boost/boost/geometry/util/promote_floating_point.hpp

   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