Chris@16: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@16: 
Chris@101: // Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
Chris@101: // Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
Chris@101: // Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
Chris@101: 
Chris@101: // This file was modified by Oracle on 2014.
Chris@101: // Modifications copyright (c) 2014, Oracle and/or its affiliates.
Chris@101: 
Chris@101: // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
Chris@16: 
Chris@16: // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
Chris@16: // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software License,
Chris@16: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
Chris@16: #define BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
Chris@16: 
Chris@101: #include <boost/variant/variant_fwd.hpp>
Chris@16: 
Chris@16: #include <boost/geometry/core/coordinate_type.hpp>
Chris@101: 
Chris@101: #include <boost/geometry/util/compress_variant.hpp>
Chris@16: #include <boost/geometry/util/select_most_precise.hpp>
Chris@101: #include <boost/geometry/util/transform_variant.hpp>
Chris@16: 
Chris@16: 
Chris@16: namespace boost { namespace geometry
Chris@16: {
Chris@16: 
Chris@101: 
Chris@101: namespace resolve_strategy
Chris@101: {
Chris@101: 
Chris@101: template <typename Geometry>
Chris@101: struct default_length_result
Chris@101: {
Chris@101:     typedef typename select_most_precise
Chris@101:         <
Chris@101:             typename coordinate_type<Geometry>::type,
Chris@101:             long double
Chris@101:         >::type type;
Chris@101: };
Chris@101: 
Chris@101: } // namespace resolve_strategy
Chris@101: 
Chris@101: 
Chris@101: namespace resolve_variant
Chris@101: {
Chris@101: 
Chris@101: template <typename Geometry>
Chris@101: struct default_length_result
Chris@101:     : resolve_strategy::default_length_result<Geometry>
Chris@101: {};
Chris@101: 
Chris@101: template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
Chris@101: struct default_length_result<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
Chris@101: {
Chris@101:     typedef typename compress_variant<
Chris@101:         typename transform_variant<
Chris@101:             boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>,
Chris@101:             resolve_strategy::default_length_result<boost::mpl::placeholders::_>
Chris@101:         >::type
Chris@101:     >::type type;
Chris@101: };
Chris@101: 
Chris@101: } // namespace resolve_variant
Chris@101: 
Chris@101: 
Chris@16: /*!
Chris@16:     \brief Meta-function defining return type of length function
Chris@16:     \ingroup length
Chris@16:     \note Length of a line of integer coordinates can be double.
Chris@16:         So we take at least a double. If Big Number types are used,
Chris@16:         we take that type.
Chris@16: 
Chris@16:  */
Chris@16: template <typename Geometry>
Chris@16: struct default_length_result
Chris@101:     : resolve_variant::default_length_result<Geometry>
Chris@101: {};
Chris@101: 
Chris@16: 
Chris@16: }} // namespace boost::geometry
Chris@16: 
Chris@16: #endif // BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP