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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
// Copyright (c) 2013-2015 Adam Wulkiewicz, Lodz, Poland.
// Copyright (c) 2014-2015 Samuel Debionne, Grenoble, France.
// This file was modified by Oracle on 2014, 2015.
// Modifications copyright (c) 2014-2015, Oracle and/or its affiliates.
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GEOMETRY_STRATEGIES_DISTANCE_RESULT_HPP
#define BOOST_GEOMETRY_STRATEGIES_DISTANCE_RESULT_HPP
#include <boost/mpl/always.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/vector.hpp>
#include <boost/variant/variant_fwd.hpp>
#include <boost/geometry/core/point_type.hpp>
#include <boost/geometry/strategies/default_strategy.hpp>
#include <boost/geometry/strategies/distance.hpp>
#include <boost/geometry/util/compress_variant.hpp>
#include <boost/geometry/util/transform_variant.hpp>
#include <boost/geometry/util/combine_if.hpp>
#include <boost/geometry/algorithms/detail/distance/default_strategies.hpp>
namespace boost { namespace geometry
{
namespace resolve_strategy
{
template <typename Geometry1, typename Geometry2, typename Strategy>
struct distance_result
: strategy::distance::services::return_type
<
Strategy,
typename point_type<Geometry1>::type,
typename point_type<Geometry2>::type
>
{};
template <typename Geometry1, typename Geometry2>
struct distance_result<Geometry1, Geometry2, default_strategy>
: distance_result
<
Geometry1,
Geometry2,
typename detail::distance::default_strategy
<
Geometry1, Geometry2
>::type
>
{};
} // namespace resolve_strategy
namespace resolve_variant
{
template <typename Geometry1, typename Geometry2, typename Strategy>
struct distance_result
: resolve_strategy::distance_result
<
Geometry1,
Geometry2,
Strategy
>
{};
template
<
typename Geometry1,
BOOST_VARIANT_ENUM_PARAMS(typename T),
typename Strategy
>
struct distance_result
<
Geometry1, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Strategy
>
{
// A set of all variant type combinations that are compatible and
// implemented
typedef typename util::combine_if<
typename boost::mpl::vector1<Geometry1>,
typename boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types,
// Here we want should remove most of the combinations that
// are not valid, mostly to limit the size of the resulting MPL set.
// But is_implementedn is not ready for prime time
//
// util::is_implemented2<boost::mpl::_1, boost::mpl::_2, dispatch::distance<boost::mpl::_1, boost::mpl::_2> >
boost::mpl::always<boost::mpl::true_>
>::type possible_input_types;
// The (possibly variant) result type resulting from these combinations
typedef typename compress_variant<
typename transform_variant<
possible_input_types,
resolve_strategy::distance_result<
boost::mpl::first<boost::mpl::_>,
boost::mpl::second<boost::mpl::_>,
Strategy
>,
boost::mpl::back_inserter<boost::mpl::vector0<> >
>::type
>::type type;
};
// Distance arguments are commutative
template
<
BOOST_VARIANT_ENUM_PARAMS(typename T),
typename Geometry2,
typename Strategy
>
struct distance_result
<
boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>,
Geometry2,
Strategy
> : public distance_result
<
Geometry2, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Strategy
>
{};
template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Strategy>
struct distance_result
<
boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>,
boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>,
Strategy
>
{
// A set of all variant type combinations that are compatible and
// implemented
typedef typename util::combine_if
<
typename boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types,
typename boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types,
// Here we want to try to remove most of the combinations
// that are not valid, mostly to limit the size of the
// resulting MPL vector.
// But is_implemented is not ready for prime time
//
// util::is_implemented2<boost::mpl::_1, boost::mpl::_2, dispatch::distance<boost::mpl::_1, boost::mpl::_2> >
boost::mpl::always<boost::mpl::true_>
>::type possible_input_types;
// The (possibly variant) result type resulting from these combinations
typedef typename compress_variant<
typename transform_variant<
possible_input_types,
resolve_strategy::distance_result<
boost::mpl::first<boost::mpl::_>,
boost::mpl::second<boost::mpl::_>,
Strategy
>,
boost::mpl::back_inserter<boost::mpl::vector0<> >
>::type
>::type type;
};
} // namespace resolve_variant
/*!
\brief Meta-function defining return type of distance function
\ingroup distance
\note The strategy defines the return-type (so this situation is different
from length, where distance is sqr/sqrt, but length always squared)
*/
template
<
typename Geometry1,
typename Geometry2 = Geometry1,
typename Strategy = void
>
struct distance_result
: resolve_variant::distance_result<Geometry1, Geometry2, Strategy>
{};
template <typename Geometry1, typename Geometry2>
struct distance_result<Geometry1, Geometry2, void>
: distance_result<Geometry1, Geometry2, default_strategy>
{};
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_STRATEGIES_DISTANCE_RESULT_HPP
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