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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2014-2021, Oracle and/or its affiliates.
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// Licensed under the Boost Software License version 1.0.
// http://www.boost.org/users/license.html
#ifndef BOOST_GEOMETRY_STRATEGIES_COMPARABLE_DISTANCE_RESULT_HPP
#define BOOST_GEOMETRY_STRATEGIES_COMPARABLE_DISTANCE_RESULT_HPP
#include <boost/geometry/algorithms/detail/select_geometry_type.hpp>
#include <boost/geometry/core/point_type.hpp>
#include <boost/geometry/core/reverse_dispatch.hpp>
#include <boost/geometry/strategies/default_strategy.hpp>
#include <boost/geometry/strategies/detail.hpp>
#include <boost/geometry/strategies/distance.hpp>
#include <boost/geometry/strategies/distance/services.hpp>
#include <boost/geometry/util/select_most_precise.hpp>
#include <boost/geometry/util/sequence.hpp>
#include <boost/geometry/util/type_traits.hpp>
namespace boost { namespace geometry
{
namespace resolve_strategy
{
// TODO: This utility could be entirely implemented as:
// decltype(geometry::comparable_distance(std::declval<Geometry1>(), std::declval<Geometry2>(), std::declval<Strategy>()))
// however then the algorithm would have to be compiled.
template
<
typename Geometry1, typename Geometry2, typename Strategy,
bool IsUmbrella = strategies::detail::is_umbrella_strategy<Strategy>::value
>
struct comparable_distance_strategy2_type
{
typedef decltype(std::declval<Strategy>().distance(
std::declval<Geometry1>(), std::declval<Geometry2>())) type;
};
template <typename Geometry1, typename Geometry2, typename Strategy>
struct comparable_distance_strategy2_type<Geometry1, Geometry2, Strategy, false>
{
typedef Strategy type;
};
template
<
typename Geometry1, typename Geometry2, typename Strategy,
bool Reverse = reverse_dispatch<Geometry1, Geometry2>::type::value
>
struct comparable_distance_strategy_type
: strategy::distance::services::comparable_type
<
typename comparable_distance_strategy2_type
<
Geometry1, Geometry2, Strategy
>::type
>
{};
template <typename Geometry1, typename Geometry2, typename Strategy>
struct comparable_distance_strategy_type<Geometry1, Geometry2, Strategy, true>
: comparable_distance_strategy_type<Geometry2, Geometry1, Strategy, false>
{};
template <typename Geometry1, typename Geometry2, typename Strategy>
struct comparable_distance_result
: strategy::distance::services::return_type
<
typename comparable_distance_strategy_type<Geometry1, Geometry2, Strategy>::type,
typename point_type<Geometry1>::type,
typename point_type<Geometry2>::type
>
{};
template <typename Geometry1, typename Geometry2>
struct comparable_distance_result<Geometry1, Geometry2, default_strategy>
: comparable_distance_result
<
Geometry1,
Geometry2,
typename strategies::distance::services::default_strategy
<
Geometry1, Geometry2
>::type
>
{};
} // namespace resolve_strategy
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace distance
{
template <typename Strategy = geometry::default_strategy>
struct more_precise_comparable_distance_result
{
template <typename Curr, typename Next>
struct predicate
: std::is_same
<
typename resolve_strategy::comparable_distance_result
<
typename util::sequence_element<0, Curr>::type,
typename util::sequence_element<1, Curr>::type,
Strategy
>::type,
typename geometry::select_most_precise
<
typename resolve_strategy::comparable_distance_result
<
typename util::sequence_element<0, Curr>::type,
typename util::sequence_element<1, Curr>::type,
Strategy
>::type,
typename resolve_strategy::comparable_distance_result
<
typename util::sequence_element<0, Next>::type,
typename util::sequence_element<1, Next>::type,
Strategy
>::type
>::type
>
{};
};
}} // namespace detail::distance
#endif //DOXYGEN_NO_DETAIL
namespace resolve_dynamic
{
template
<
typename Geometry1, typename Geometry2, typename Strategy,
bool IsDynamicOrCollection = util::is_dynamic_geometry<Geometry1>::value
|| util::is_dynamic_geometry<Geometry2>::value
|| util::is_geometry_collection<Geometry1>::value
|| util::is_geometry_collection<Geometry2>::value
>
struct comparable_distance_result
: resolve_strategy::comparable_distance_result
<
Geometry1,
Geometry2,
Strategy
>
{};
template <typename Geometry1, typename Geometry2, typename Strategy>
struct comparable_distance_result<Geometry1, Geometry2, Strategy, true>
{
// Select the most precise distance strategy result type
// for all variant type combinations.
// TODO: We should ignore the combinations that are not valid
// but is_implemented is not ready for prime time.
using selected_types = typename detail::select_geometry_types
<
Geometry1, Geometry2,
detail::distance::more_precise_comparable_distance_result<Strategy>::template predicate
>::type;
using type = typename resolve_strategy::comparable_distance_result
<
typename util::sequence_element<0, selected_types>::type,
typename util::sequence_element<1, selected_types>::type,
Strategy
>::type;
};
} // namespace resolve_dynamic
/*!
\brief Meta-function defining return type of comparable_distance function
\ingroup distance
*/
template
<
typename Geometry1,
typename Geometry2 = Geometry1,
typename Strategy = void
>
struct comparable_distance_result
: resolve_dynamic::comparable_distance_result
<
Geometry1, Geometry2, Strategy
>
{};
template <typename Geometry1, typename Geometry2>
struct comparable_distance_result<Geometry1, Geometry2, void>
: comparable_distance_result<Geometry1, Geometry2, default_strategy>
{};
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_STRATEGIES_COMPARABLE_DISTANCE_RESULT_HPP
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