107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2014-2020.
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// Modifications copyright (c) 2014-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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#define BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/util/select_most_precise.hpp>
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#include <boost/geometry/util/type_traits.hpp>
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namespace boost { namespace geometry
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{
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namespace resolve_strategy
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{
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// NOTE: The implementation was simplified greately preserving the old
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// behavior. In general case the result types of Strategies should be
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// taken into account.
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// It would probably be enough to use distance_result and
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// default_distance_result here.
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// Workaround for VS2015
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#if defined(_MSC_VER) && (_MSC_VER < 1910)
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template
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<
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typename Geometry,
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bool IsGeometry = util::is_geometry<Geometry>::value
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>
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struct coordinate_type
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: geometry::coordinate_type<Geometry>
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{};
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template <typename Geometry>
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struct coordinate_type<Geometry, false>
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{
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typedef long double type;
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};
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#endif
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template <typename ...Geometries>
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struct default_length_result
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{
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typedef typename select_most_precise
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<
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typename coordinate_type<Geometries>::type...,
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long double
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>::type type;
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};
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} // namespace resolve_strategy
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namespace resolve_variant
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{
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template <typename Geometry>
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struct default_length_result
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: resolve_strategy::default_length_result<Geometry>
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{};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct default_length_result<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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: resolve_strategy::default_length_result<BOOST_VARIANT_ENUM_PARAMS(T)>
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{};
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} // namespace resolve_variant
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/*!
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\brief Meta-function defining return type of length function
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\ingroup length
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\note Length of a line of integer coordinates can be double.
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So we take at least a double. If Big Number types are used,
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we take that type.
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*/
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template <typename Geometry>
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struct default_length_result
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: resolve_variant::default_length_result<Geometry>
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{};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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