// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
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// Copyright (c) 2013-2015 Adam Wulkiewicz, Lodz, Poland.
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// Copyright (c) 2014-2015 Samuel Debionne, Grenoble, France.
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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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// 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_DISTANCE_RESULT_HPP
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#define BOOST_GEOMETRY_STRATEGIES_DISTANCE_RESULT_HPP
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/algorithms/detail/distance/default_strategies.hpp>
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#include <boost/geometry/core/point_type.hpp>
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#include <boost/geometry/strategies/default_strategy.hpp>
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#include <boost/geometry/strategies/distance.hpp>
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#include <boost/geometry/util/select_most_precise.hpp>
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#include <boost/geometry/util/sequence.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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template
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<
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typename Geometry1, typename Geometry2, typename Strategy,
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bool AreGeometries = (util::is_geometry<Geometry1>::value
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&& util::is_geometry<Geometry2>::value)
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>
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struct distance_result
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: strategy::distance::services::return_type
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<
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Strategy,
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typename point_type<Geometry1>::type,
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typename point_type<Geometry2>::type
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>
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{};
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template <typename Geometry1, typename Geometry2, bool AreGeometries>
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struct distance_result<Geometry1, Geometry2, default_strategy, AreGeometries>
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: distance_result
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<
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Geometry1,
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Geometry2,
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typename detail::distance::default_strategy
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<
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Geometry1, Geometry2
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>::type
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>
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{};
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// Workaround for VS2015
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#if defined(_MSC_VER) && (_MSC_VER < 1910)
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct distance_result<Geometry1, Geometry2, Strategy, false>
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{
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typedef int type;
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};
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template <typename Geometry1, typename Geometry2>
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struct distance_result<Geometry1, Geometry2, default_strategy, false>
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{
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typedef int type;
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};
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#endif
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} // namespace resolve_strategy
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace distance
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{
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template <typename Strategy = geometry::default_strategy>
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struct more_precise_distance_result
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{
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template <typename Curr, typename Next>
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struct predicate
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: std::is_same
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<
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typename resolve_strategy::distance_result
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<
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typename util::sequence_element<0, Curr>::type,
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typename util::sequence_element<1, Curr>::type,
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Strategy
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>::type,
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typename geometry::select_most_precise
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<
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typename resolve_strategy::distance_result
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<
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typename util::sequence_element<0, Curr>::type,
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typename util::sequence_element<1, Curr>::type,
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Strategy
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>::type,
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typename resolve_strategy::distance_result
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<
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typename util::sequence_element<0, Next>::type,
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typename util::sequence_element<1, Next>::type,
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Strategy
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>::type
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>::type
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>
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{};
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};
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}} // namespace detail::distance
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#endif //DOXYGEN_NO_DETAIL
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namespace resolve_variant
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{
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct distance_result
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: resolve_strategy::distance_result
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<
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Geometry1,
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Geometry2,
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Strategy
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>
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{};
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template
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<
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typename Geometry1,
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BOOST_VARIANT_ENUM_PARAMS(typename T),
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typename Strategy
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>
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struct distance_result
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<
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Geometry1, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Strategy
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>
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{
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// Select the most precise distance strategy result type
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// for all variant type combinations.
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// TODO: We should ignore the combinations that are not valid
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// but is_implemented is not ready for prime time.
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typedef typename util::select_combination_element
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<
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util::type_sequence<Geometry1>,
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util::type_sequence<BOOST_VARIANT_ENUM_PARAMS(T)>,
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detail::distance::more_precise_distance_result<Strategy>::template predicate
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>::type elements;
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typedef typename resolve_strategy::distance_result
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<
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typename util::sequence_element<0, elements>::type,
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typename util::sequence_element<1, elements>::type,
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Strategy
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>::type type;
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};
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// Distance arguments are commutative
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template
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<
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BOOST_VARIANT_ENUM_PARAMS(typename T),
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typename Geometry2,
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typename Strategy
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>
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struct distance_result
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<
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Geometry2, Strategy
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>
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: public distance_result
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<
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Geometry2, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Strategy
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>
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{};
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template
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<
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BOOST_VARIANT_ENUM_PARAMS(typename T),
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BOOST_VARIANT_ENUM_PARAMS(typename U),
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typename Strategy
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>
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struct distance_result
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<
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>,
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(U)>,
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Strategy
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>
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{
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// Select the most precise distance strategy result type
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// for all variant type combinations.
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// TODO: We should ignore the combinations that are not valid
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// but is_implemented is not ready for prime time.
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typedef typename util::select_combination_element
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<
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util::type_sequence<BOOST_VARIANT_ENUM_PARAMS(T)>,
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util::type_sequence<BOOST_VARIANT_ENUM_PARAMS(U)>,
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detail::distance::more_precise_distance_result<Strategy>::template predicate
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>::type elements;
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typedef typename resolve_strategy::distance_result
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<
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typename util::sequence_element<0, elements>::type,
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typename util::sequence_element<1, elements>::type,
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Strategy
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>::type type;
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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 distance function
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\ingroup distance
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\note The strategy defines the return-type (so this situation is different
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from length, where distance is sqr/sqrt, but length always squared)
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*/
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template
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<
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typename Geometry1,
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typename Geometry2 = Geometry1,
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typename Strategy = void
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>
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struct distance_result
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: resolve_variant::distance_result<Geometry1, Geometry2, Strategy>
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{};
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template <typename Geometry1, typename Geometry2>
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struct distance_result<Geometry1, Geometry2, void>
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: distance_result<Geometry1, Geometry2, default_strategy>
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{};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGIES_DISTANCE_RESULT_HPP
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