ceph/src/boost/libs/geometry/include/boost/geometry/algorithms/detail/throw_on_empty_input.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
   6
   7 // This file was modified by Oracle on 2015.
   8 // Modifications copyright (c) 2015, Oracle and/or its affiliates.
   9
  10 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
  11
  12 // Use, modification and distribution is subject to the Boost Software License,
  13 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  14 // http://www.boost.org/LICENSE_1_0.txt)
  15
  16 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_THROW_ON_EMPTY_INPUT_HPP
  17 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_THROW_ON_EMPTY_INPUT_HPP
  18
  19 #include <boost/geometry/core/exception.hpp>
  20 #include <boost/geometry/algorithms/is_empty.hpp>
  21
  22 // BSG 2012-02-06: we use this currently only for distance.
  23 // For other scalar results area,length,perimeter it is commented on purpose.
  24 // Reason is that for distance there is no other choice. distance of two
  25 // empty geometries (or one empty) should NOT return any value.
  26 // But for area it is no problem to be 0.
  27 // Suppose: area(intersection(a,b)). We (probably) don't want a throw there...
  28
  29 // So decided that at least for Boost 1.49 this is commented for
  30 // scalar results, except distance.
  31
  32 #if defined(BOOST_GEOMETRY_EMPTY_INPUT_NO_THROW)
  33 #include <boost/core/ignore_unused.hpp>
  34 #endif
  35
  36 namespace boost { namespace geometry
  37 {
  38
  39 #ifndef DOXYGEN_NO_DETAIL
  40 namespace detail
  41 {
  42
  43 template <typename Geometry>
  44 inline void throw_on_empty_input(Geometry const& geometry)
  45 {
  46 #if ! defined(BOOST_GEOMETRY_EMPTY_INPUT_NO_THROW)
  47     if (geometry::is_empty(geometry))
  48     {
  49         throw empty_input_exception();
  50     }
  51 #else
  52     boost::ignore_unused(geometry);
  53 #endif
  54 }
  55
  56 } // namespace detail
  57 #endif // DOXYGEN_NO_DETAIL
  58
  59
  60 }} // namespace boost::geometry
  61
  62
  63 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_THROW_ON_EMPTY_INPUT_HPP
  64