ceph/src/boost/libs/geometry/include/boost/geometry/algorithms/detail/distance/is_comparable.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2014, Oracle and/or its affiliates.
   4
   5 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
   6
   7 // Licensed under the Boost Software License version 1.0.
   8 // http://www.boost.org/users/license.html
   9
  10 #ifndef BOOST_GEOMETRY_ALGORITHS_DETAIL_DISTANCE_IS_COMPARABLE_HPP
  11 #define BOOST_GEOMETRY_ALGORITHS_DETAIL_DISTANCE_IS_COMPARABLE_HPP
  12
  13 #include <boost/type_traits/is_same.hpp>
  14
  15 #include <boost/geometry/strategies/distance.hpp>
  16
  17
  18 namespace boost { namespace geometry
  19 {
  20
  21 #ifndef DOXYGEN_NO_DETAIL
  22 namespace detail { namespace distance
  23 {
  24
  25
  26 // metafunction to determine is a strategy is comparable or not
  27 template <typename Strategy>
  28 struct is_comparable
  29     : boost::is_same
  30         <
  31             Strategy,
  32             typename strategy::distance::services::comparable_type
  33               <
  34                   Strategy
  35               >::type
  36         >
  37 {};
  38
  39
  40 }} // namespace detail::distance
  41 #endif // DOXYGEN_NO_DETAIL
  42
  43 }} // namespace boost::geometry
  44
  45 #endif // BOOST_GEOMETRY_ALGORITHS_DETAIL_DISTANCE_IS_COMPARABLE_HPP