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- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
- // Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
- // Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
- // This file was modified by Oracle on 2014.
- // Modifications copyright (c) 2014, Oracle and/or its affiliates.
- // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
- // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
- // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
- // 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_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
- #define BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
- #include <boost/variant/variant_fwd.hpp>
- #include <boost/geometry/core/coordinate_type.hpp>
- #include <boost/geometry/util/compress_variant.hpp>
- #include <boost/geometry/util/select_most_precise.hpp>
- #include <boost/geometry/util/transform_variant.hpp>
- namespace boost { namespace geometry
- {
- namespace resolve_strategy
- {
- template <typename Geometry>
- struct default_length_result
- {
- typedef typename select_most_precise
- <
- typename coordinate_type<Geometry>::type,
- long double
- >::type type;
- };
- } // namespace resolve_strategy
- namespace resolve_variant
- {
- template <typename Geometry>
- struct default_length_result
- : resolve_strategy::default_length_result<Geometry>
- {};
- template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
- struct default_length_result<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
- {
- typedef typename compress_variant<
- typename transform_variant<
- boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>,
- resolve_strategy::default_length_result<boost::mpl::placeholders::_>
- >::type
- >::type type;
- };
- } // namespace resolve_variant
- /*!
- \brief Meta-function defining return type of length function
- \ingroup length
- \note Length of a line of integer coordinates can be double.
- So we take at least a double. If Big Number types are used,
- we take that type.
- */
- template <typename Geometry>
- struct default_length_result
- : resolve_variant::default_length_result<Geometry>
- {};
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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