87 lines
2.5 KiB
C++
87 lines
2.5 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 2014-2021.
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// Modifications copyright (c) 2014-2021, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, 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/geometry/algorithms/detail/select_geometry_type.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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} // namespace resolve_strategy
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namespace resolve_dynamic
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{
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template <typename Sequence>
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struct default_length_result_impl;
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template <typename ...Geometries>
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struct default_length_result_impl<util::type_sequence<Geometries...>>
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{
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using type = 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;
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};
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template <typename Geometry>
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struct default_length_result
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: default_length_result_impl<typename detail::geometry_types<Geometry>::type>
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{};
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} // namespace resolve_dynamic
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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_dynamic::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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