| // Boost.Geometry (aka GGL, Generic Geometry Library) |
| |
| // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. |
| // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. |
| // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. |
| |
| // Use, modification and distribution is subject to the Boost Software License, |
| // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_THROW_ON_EMPTY_INPUT_HPP |
| #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_THROW_ON_EMPTY_INPUT_HPP |
| |
| #include <boost/geometry/core/exception.hpp> |
| #include <boost/geometry/algorithms/num_points.hpp> |
| |
| // BSG 2012-02-06: we use this currently only for distance. |
| // For other scalar results area,length,perimeter it is commented on purpose. |
| // Reason is that for distance there is no other choice. distance of two |
| // empty geometries (or one empty) should NOT return any value. |
| // But for area it is no problem to be 0. |
| // Suppose: area(intersection(a,b)). We (probably) don't want a throw there... |
| |
| // So decided that at least for Boost 1.49 this is commented for |
| // scalar results, except distance. |
| |
| #if defined(BOOST_GEOMETRY_EMPTY_INPUT_NO_THROW) |
| #include <boost/core/ignore_unused.hpp> |
| #endif |
| |
| namespace boost { namespace geometry |
| { |
| |
| #ifndef DOXYGEN_NO_DETAIL |
| namespace detail |
| { |
| |
| template <typename Geometry> |
| inline void throw_on_empty_input(Geometry const& geometry) |
| { |
| #if ! defined(BOOST_GEOMETRY_EMPTY_INPUT_NO_THROW) |
| if (geometry::num_points(geometry) == 0) |
| { |
| throw empty_input_exception(); |
| } |
| #else |
| boost::ignore_unused(geometry); |
| #endif |
| } |
| |
| } // namespace detail |
| #endif // DOXYGEN_NO_DETAIL |
| |
| |
| }} // namespace boost::geometry |
| |
| |
| #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_THROW_ON_EMPTY_INPUT_HPP |
| |