[ceph.git] / ceph / src / boost / boost / geometry / algorithms / difference.hpp

// Boost.Geometry (aka GGL, Generic Geometry Library)

// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.

// This file was modified by Oracle on 2017, 2019, 2020.
// Modifications copyright (c) 2017-2020, Oracle and/or its affiliates.

// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle

// 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_ALGORITHMS_DIFFERENCE_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DIFFERENCE_HPP


#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>
#include <boost/variant/variant_fwd.hpp>

#include <boost/geometry/algorithms/detail/intersection/multi.hpp>
#include <boost/geometry/algorithms/detail/overlay/intersection_insert.hpp>
#include <boost/geometry/policies/robustness/get_rescale_policy.hpp>
#include <boost/geometry/strategies/default_strategy.hpp>
#include <boost/geometry/util/range.hpp>


namespace boost { namespace geometry
{

#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace difference
{

template
<
    typename Geometry1,
    typename Geometry2,
    typename SingleOut,
    typename OutTag = typename detail::setop_insert_output_tag<SingleOut>::type,
    bool ReturnGeometry1 = (topological_dimension<Geometry1>::value
                            > topological_dimension<Geometry2>::value)
>
struct call_intersection_insert
{
    template
    <
        typename OutputIterator,
        typename RobustPolicy,
        typename Strategy
    >
    static inline OutputIterator apply(Geometry1 const& geometry1,
                                       Geometry2 const& geometry2,
                                       RobustPolicy const& robust_policy,
                                       OutputIterator out,
                                       Strategy const& strategy)
    {
        return geometry::dispatch::intersection_insert
            <
                Geometry1, Geometry2,
                SingleOut,
                overlay_difference,
                geometry::detail::overlay::do_reverse<geometry::point_order<Geometry1>::value>::value,
                geometry::detail::overlay::do_reverse<geometry::point_order<Geometry2>::value, true>::value
            >::apply(geometry1, geometry2, robust_policy, out, strategy);
    }
};

template
<
    typename Geometry1,
    typename Geometry2,
    typename SingleOut
>
struct call_intersection_insert_tupled_base
{
    typedef typename geometry::detail::single_tag_from_base_tag
        <
            typename geometry::tag_cast
                <
                    typename geometry::tag<Geometry1>::type,
                    pointlike_tag, linear_tag, areal_tag
                >::type
        >::type single_tag;

    typedef detail::expect_output
        <
            Geometry1, Geometry2, SingleOut, single_tag
        > expect_check;

    typedef typename geometry::detail::output_geometry_access
        <
            SingleOut, single_tag, single_tag
        > access;
};

template
<
    typename Geometry1,
    typename Geometry2,
    typename SingleOut
>
struct call_intersection_insert
    <
        Geometry1, Geometry2, SingleOut,
        detail::tupled_output_tag,
        false
    >
    : call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut>
{
    typedef call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut> base_t;

    template
    <
        typename OutputIterator,
        typename RobustPolicy,
        typename Strategy
    >
    static inline OutputIterator apply(Geometry1 const& geometry1,
                                       Geometry2 const& geometry2,
                                       RobustPolicy const& robust_policy,
                                       OutputIterator out,
                                       Strategy const& strategy)
    {
        base_t::access::get(out) = call_intersection_insert
            <
                Geometry1, Geometry2,
                typename base_t::access::type
            >::apply(geometry1, geometry2, robust_policy,
                     base_t::access::get(out), strategy);

        return out;
    }
};

template
<
    typename Geometry1,
    typename Geometry2,
    typename SingleOut
>
struct call_intersection_insert
    <
        Geometry1, Geometry2, SingleOut,
        detail::tupled_output_tag,
        true
    >
    : call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut>
{
    typedef call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut> base_t;

    template
    <
        typename OutputIterator,
        typename RobustPolicy,
        typename Strategy
    >
    static inline OutputIterator apply(Geometry1 const& geometry1,
                                       Geometry2 const& geometry2,
                                       RobustPolicy const& robust_policy,
                                       OutputIterator out,
                                       Strategy const& strategy)
    {
        base_t::access::get(out) = geometry::detail::convert_to_output
            <
                Geometry1,
                typename base_t::access::type
            >::apply(geometry1, base_t::access::get(out));

        return out;
    }
};


/*!
\brief_calc2{difference} \brief_strategy
\ingroup difference
\details \details_calc2{difference_insert, spatial set theoretic difference}
    \brief_strategy. \details_inserter{difference}
\tparam GeometryOut output geometry type, must be specified
\tparam Geometry1 \tparam_geometry
\tparam Geometry2 \tparam_geometry
\tparam OutputIterator output iterator
\tparam Strategy \tparam_strategy_overlay
\param geometry1 \param_geometry
\param geometry2 \param_geometry
\param out \param_out{difference}
\param strategy \param_strategy{difference}
\return \return_out

\qbk{distinguish,with strategy}
*/
template
<
    typename GeometryOut,
    typename Geometry1,
    typename Geometry2,
    typename OutputIterator,
    typename Strategy
>
inline OutputIterator difference_insert(Geometry1 const& geometry1,
                                        Geometry2 const& geometry2,
                                        OutputIterator out,
                                        Strategy const& strategy)
{
    concepts::check<Geometry1 const>();
    concepts::check<Geometry2 const>();
    //concepts::check<GeometryOut>();
    geometry::detail::output_geometry_concept_check<GeometryOut>::apply();

    typedef typename geometry::rescale_overlay_policy_type
        <
            Geometry1,
            Geometry2,
            typename Strategy::cs_tag
        >::type rescale_policy_type;

    rescale_policy_type robust_policy
        = geometry::get_rescale_policy<rescale_policy_type>(
            geometry1, geometry2, strategy);

    return geometry::detail::difference::call_intersection_insert
        <
            Geometry1, Geometry2, GeometryOut
        >::apply(geometry1, geometry2, robust_policy, out, strategy);
}

/*!
\brief_calc2{difference}
\ingroup difference
\details \details_calc2{difference_insert, spatial set theoretic difference}.
    \details_insert{difference}
\tparam GeometryOut output geometry type, must be specified
\tparam Geometry1 \tparam_geometry
\tparam Geometry2 \tparam_geometry
\tparam OutputIterator output iterator
\param geometry1 \param_geometry
\param geometry2 \param_geometry
\param out \param_out{difference}
\return \return_out

\qbk{[include reference/algorithms/difference_insert.qbk]}
*/
template
<
    typename GeometryOut,
    typename Geometry1,
    typename Geometry2,
    typename OutputIterator
>
inline OutputIterator difference_insert(Geometry1 const& geometry1,
                                        Geometry2 const& geometry2,
                                        OutputIterator out)
{
    typedef typename strategy::relate::services::default_strategy
        <
            Geometry1,
            Geometry2
        >::type strategy_type;

    return difference_insert<GeometryOut>(geometry1, geometry2, out,
                                          strategy_type());
}


}} // namespace detail::difference
#endif // DOXYGEN_NO_DETAIL


namespace resolve_strategy {

struct difference
{
    template
    <
        typename Geometry1,
        typename Geometry2,
        typename Collection,
        typename Strategy
    >
    static inline void apply(Geometry1 const& geometry1,
                             Geometry2 const& geometry2,
                             Collection & output_collection,
                             Strategy const& strategy)
    {
        typedef typename geometry::detail::output_geometry_value
            <
                Collection
            >::type single_out;

        detail::difference::difference_insert<single_out>(
            geometry1, geometry2,
            geometry::detail::output_geometry_back_inserter(output_collection),
            strategy);
    }

    template
    <
        typename Geometry1,
        typename Geometry2,
        typename Collection
    >
    static inline void apply(Geometry1 const& geometry1,
                             Geometry2 const& geometry2,
                             Collection & output_collection,
                             default_strategy)
    {
        typedef typename strategy::relate::services::default_strategy
            <
                Geometry1,
                Geometry2
            >::type strategy_type;
        
        apply(geometry1, geometry2, output_collection, strategy_type());
    }
};

} // resolve_strategy


namespace resolve_variant
{
    
template <typename Geometry1, typename Geometry2>
struct difference
{
    template <typename Collection, typename Strategy>
    static inline void apply(Geometry1 const& geometry1,
                             Geometry2 const& geometry2,
                             Collection& output_collection,
                             Strategy const& strategy)
    {
        resolve_strategy::difference::apply(geometry1, geometry2,
                                            output_collection,
                                            strategy);
    }
};


template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Geometry2>
struct difference<variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Geometry2>
{
    template <typename Collection, typename Strategy>
    struct visitor: static_visitor<>
    {
        Geometry2 const& m_geometry2;
        Collection& m_output_collection;
        Strategy const& m_strategy;
        
        visitor(Geometry2 const& geometry2,
                Collection& output_collection,
                Strategy const& strategy)
            : m_geometry2(geometry2)
            , m_output_collection(output_collection)
            , m_strategy(strategy)
        {}
        
        template <typename Geometry1>
        void operator()(Geometry1 const& geometry1) const
        {
            difference
                <
                    Geometry1,
                    Geometry2
                >::apply(geometry1, m_geometry2, m_output_collection, m_strategy);
        }
    };
    
    template <typename Collection, typename Strategy>
    static inline void
    apply(variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry1,
          Geometry2 const& geometry2,
          Collection& output_collection,
          Strategy const& strategy)
    {
        boost::apply_visitor(visitor<Collection, Strategy>(geometry2,
                                                           output_collection,
                                                           strategy),
                             geometry1);
    }
};


template <typename Geometry1, BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct difference<Geometry1, variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
    template <typename Collection, typename Strategy>
    struct visitor: static_visitor<>
    {
        Geometry1 const& m_geometry1;
        Collection& m_output_collection;
        Strategy const& m_strategy;
        
        visitor(Geometry1 const& geometry1,
                Collection& output_collection,
                Strategy const& strategy)
            : m_geometry1(geometry1)
            , m_output_collection(output_collection)
            , m_strategy(strategy)
        {}
        
        template <typename Geometry2>
        void operator()(Geometry2 const& geometry2) const
        {
            difference
                <
                    Geometry1,
                    Geometry2
                >::apply(m_geometry1, geometry2, m_output_collection, m_strategy);
        }
    };
    
    template <typename Collection, typename Strategy>
    static inline void
    apply(Geometry1 const& geometry1,
          variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry2,
          Collection& output_collection,
          Strategy const& strategy)
    {
        boost::apply_visitor(visitor<Collection, Strategy>(geometry1,
                                                           output_collection,
                                                           strategy),
                             geometry2);
    }
};


template <BOOST_VARIANT_ENUM_PARAMS(typename T1), BOOST_VARIANT_ENUM_PARAMS(typename T2)>
struct difference<variant<BOOST_VARIANT_ENUM_PARAMS(T1)>, variant<BOOST_VARIANT_ENUM_PARAMS(T2)> >
{
    template <typename Collection, typename Strategy>
    struct visitor: static_visitor<>
    {
        Collection& m_output_collection;
        Strategy const& m_strategy;
        
        visitor(Collection& output_collection, Strategy const& strategy)
            : m_output_collection(output_collection)
            , m_strategy(strategy)
        {}
        
        template <typename Geometry1, typename Geometry2>
        void operator()(Geometry1 const& geometry1,
                        Geometry2 const& geometry2) const
        {
            difference
                <
                    Geometry1,
                    Geometry2
                >::apply(geometry1, geometry2, m_output_collection, m_strategy);
        }
    };
    
    template <typename Collection, typename Strategy>
    static inline void
    apply(variant<BOOST_VARIANT_ENUM_PARAMS(T1)> const& geometry1,
          variant<BOOST_VARIANT_ENUM_PARAMS(T2)> const& geometry2,
          Collection& output_collection,
          Strategy const& strategy)
    {
        boost::apply_visitor(visitor<Collection, Strategy>(output_collection,
                                                           strategy),
                             geometry1, geometry2);
    }
};
    
} // namespace resolve_variant


/*!
\brief_calc2{difference}
\ingroup difference
\details \details_calc2{difference, spatial set theoretic difference}.
\tparam Geometry1 \tparam_geometry
\tparam Geometry2 \tparam_geometry
\tparam Collection \tparam_output_collection
\tparam Strategy \tparam_strategy{Difference}
\param geometry1 \param_geometry
\param geometry2 \param_geometry
\param output_collection the output collection
\param strategy \param_strategy{difference}

\qbk{distinguish,with strategy}
\qbk{[include reference/algorithms/difference.qbk]}
*/
template
<
    typename Geometry1,
    typename Geometry2,
    typename Collection,
    typename Strategy
>
inline void difference(Geometry1 const& geometry1,
                       Geometry2 const& geometry2,
                       Collection& output_collection,
                       Strategy const& strategy)
{
    resolve_variant::difference
        <
            Geometry1,
            Geometry2
        >::apply(geometry1, geometry2, output_collection, strategy);
}


/*!
\brief_calc2{difference}
\ingroup difference
\details \details_calc2{difference, spatial set theoretic difference}.
\tparam Geometry1 \tparam_geometry
\tparam Geometry2 \tparam_geometry
\tparam Collection \tparam_output_collection
\param geometry1 \param_geometry
\param geometry2 \param_geometry
\param output_collection the output collection

\qbk{[include reference/algorithms/difference.qbk]}
*/
template
<
    typename Geometry1,
    typename Geometry2,
    typename Collection
>
inline void difference(Geometry1 const& geometry1,
                       Geometry2 const& geometry2,
                       Collection& output_collection)
{
    resolve_variant::difference
        <
            Geometry1,
            Geometry2
        >::apply(geometry1, geometry2, output_collection, default_strategy());
}


}} // namespace boost::geometry


#endif // BOOST_GEOMETRY_ALGORITHMS_DIFFERENCE_HPP
Commit	Line	Data
b32b8144 FG	1	// Boost.Geometry (aka GGL, Generic Geometry Library)
	2
	3	// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
	4
20effc67 TL	5	// This file was modified by Oracle on 2017, 2019, 2020.
20effc67 TL	6	// Modifications copyright (c) 2017-2020, Oracle and/or its affiliates.
b32b8144 FG	7
	8	// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
	9
	10	// Use, modification and distribution is subject to the Boost Software License,
	11	// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
	12	// http://www.boost.org/LICENSE_1_0.txt)
	13
	14	#ifndef BOOST_GEOMETRY_ALGORITHMS_DIFFERENCE_HPP
	15	#define BOOST_GEOMETRY_ALGORITHMS_DIFFERENCE_HPP
	16
	17
	18	#include <boost/variant/apply_visitor.hpp>
	19	#include <boost/variant/static_visitor.hpp>
	20	#include <boost/variant/variant_fwd.hpp>
	21
20effc67	22	#include <boost/geometry/algorithms/detail/intersection/multi.hpp>
b32b8144 FG	23	#include <boost/geometry/algorithms/detail/overlay/intersection_insert.hpp>
	24	#include <boost/geometry/policies/robustness/get_rescale_policy.hpp>
	25	#include <boost/geometry/strategies/default_strategy.hpp>
	26	#include <boost/geometry/util/range.hpp>
	27
	28
	29	namespace boost { namespace geometry
	30	{
	31
	32	#ifndef DOXYGEN_NO_DETAIL
	33	namespace detail { namespace difference
	34	{
	35
20effc67 TL	36	template
	37	<
	38	typename Geometry1,
	39	typename Geometry2,
	40	typename SingleOut,
	41	typename OutTag = typename detail::setop_insert_output_tag<SingleOut>::type,
	42	bool ReturnGeometry1 = (topological_dimension<Geometry1>::value
	43	> topological_dimension<Geometry2>::value)
	44	>
	45	struct call_intersection_insert
	46	{
	47	template
	48	<
	49	typename OutputIterator,
	50	typename RobustPolicy,
	51	typename Strategy
	52	>
	53	static inline OutputIterator apply(Geometry1 const& geometry1,
	54	Geometry2 const& geometry2,
	55	RobustPolicy const& robust_policy,
	56	OutputIterator out,
	57	Strategy const& strategy)
	58	{
	59	return geometry::dispatch::intersection_insert
	60	<
	61	Geometry1, Geometry2,
	62	SingleOut,
	63	overlay_difference,
	64	geometry::detail::overlay::do_reverse<geometry::point_order<Geometry1>::value>::value,
	65	geometry::detail::overlay::do_reverse<geometry::point_order<Geometry2>::value, true>::value
	66	>::apply(geometry1, geometry2, robust_policy, out, strategy);
	67	}
	68	};
	69
	70	template
	71	<
	72	typename Geometry1,
	73	typename Geometry2,
	74	typename SingleOut
	75	>
	76	struct call_intersection_insert_tupled_base
	77	{
	78	typedef typename geometry::detail::single_tag_from_base_tag
	79	<
	80	typename geometry::tag_cast
	81	<
	82	typename geometry::tag<Geometry1>::type,
	83	pointlike_tag, linear_tag, areal_tag
	84	>::type
	85	>::type single_tag;
	86
	87	typedef detail::expect_output
	88	<
	89	Geometry1, Geometry2, SingleOut, single_tag
	90	> expect_check;
	91
	92	typedef typename geometry::detail::output_geometry_access
	93	<
	94	SingleOut, single_tag, single_tag
	95	> access;
	96	};
	97
	98	template
	99	<
100	typename Geometry1,
101	typename Geometry2,
102	typename SingleOut
103	>
104	struct call_intersection_insert
105	<
106	Geometry1, Geometry2, SingleOut,
107	detail::tupled_output_tag,
108	false
109	>
110	: call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut>
111	{
112	typedef call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut> base_t;
113
114	template
115	<
116	typename OutputIterator,
117	typename RobustPolicy,
118	typename Strategy
119	>
120	static inline OutputIterator apply(Geometry1 const& geometry1,
121	Geometry2 const& geometry2,
122	RobustPolicy const& robust_policy,
123	OutputIterator out,
124	Strategy const& strategy)
125	{
126	base_t::access::get(out) = call_intersection_insert
127	<
128	Geometry1, Geometry2,
129	typename base_t::access::type
130	>::apply(geometry1, geometry2, robust_policy,
131	base_t::access::get(out), strategy);
132
133	return out;
134	}
135	};
136
137	template
138	<
139	typename Geometry1,
140	typename Geometry2,
141	typename SingleOut
142	>
143	struct call_intersection_insert
144	<
145	Geometry1, Geometry2, SingleOut,
146	detail::tupled_output_tag,
147	true
148	>
149	: call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut>
150	{
151	typedef call_intersection_insert_tupled_base<Geometry1, Geometry2, SingleOut> base_t;
152
153	template
154	<
155	typename OutputIterator,
156	typename RobustPolicy,
157	typename Strategy
158	>
159	static inline OutputIterator apply(Geometry1 const& geometry1,
160	Geometry2 const& geometry2,
161	RobustPolicy const& robust_policy,
162	OutputIterator out,
163	Strategy const& strategy)
164	{
165	base_t::access::get(out) = geometry::detail::convert_to_output
166	<
167	Geometry1,
168	typename base_t::access::type
169	>::apply(geometry1, base_t::access::get(out));
170
171	return out;
172	}
173	};
174
175
b32b8144 FG	176	/*!
	177	\brief_calc2{difference} \brief_strategy
	178	\ingroup difference
	179	\details \details_calc2{difference_insert, spatial set theoretic difference}
	180	\brief_strategy. \details_inserter{difference}
	181	\tparam GeometryOut output geometry type, must be specified
	182	\tparam Geometry1 \tparam_geometry
	183	\tparam Geometry2 \tparam_geometry
	184	\tparam OutputIterator output iterator
	185	\tparam Strategy \tparam_strategy_overlay
	186	\param geometry1 \param_geometry
	187	\param geometry2 \param_geometry
	188	\param out \param_out{difference}
	189	\param strategy \param_strategy{difference}
	190	\return \return_out
	191
	192	\qbk{distinguish,with strategy}
	193	*/
	194	template
	195	<
	196	typename GeometryOut,
	197	typename Geometry1,
	198	typename Geometry2,
b32b8144 FG	199	typename OutputIterator,
	200	typename Strategy
	201	>
	202	inline OutputIterator difference_insert(Geometry1 const& geometry1,
	203	Geometry2 const& geometry2,
b32b8144 FG	204	OutputIterator out,
	205	Strategy const& strategy)
	206	{
	207	concepts::check<Geometry1 const>();
	208	concepts::check<Geometry2 const>();
20effc67 TL	209	//concepts::check<GeometryOut>();
20effc67 TL	210	geometry::detail::output_geometry_concept_check<GeometryOut>::apply();
b32b8144	211
92f5a8d4 TL	212	typedef typename geometry::rescale_overlay_policy_type
	213	<
	214	Geometry1,
	215	Geometry2,
	216	typename Strategy::cs_tag
	217	>::type rescale_policy_type;
	218
	219	rescale_policy_type robust_policy
20effc67 TL	220	= geometry::get_rescale_policy<rescale_policy_type>(
20effc67 TL	221	geometry1, geometry2, strategy);
92f5a8d4	222
20effc67	223	return geometry::detail::difference::call_intersection_insert
b32b8144	224	<
20effc67	225	Geometry1, Geometry2, GeometryOut
b32b8144 FG	226	>::apply(geometry1, geometry2, robust_policy, out, strategy);
	227	}
	228
	229	/*!
	230	\brief_calc2{difference}
	231	\ingroup difference
	232	\details \details_calc2{difference_insert, spatial set theoretic difference}.
	233	\details_insert{difference}
	234	\tparam GeometryOut output geometry type, must be specified
	235	\tparam Geometry1 \tparam_geometry
	236	\tparam Geometry2 \tparam_geometry
	237	\tparam OutputIterator output iterator
	238	\param geometry1 \param_geometry
	239	\param geometry2 \param_geometry
	240	\param out \param_out{difference}
	241	\return \return_out
	242
	243	\qbk{[include reference/algorithms/difference_insert.qbk]}
	244	*/
	245	template
	246	<
	247	typename GeometryOut,
	248	typename Geometry1,
	249	typename Geometry2,
b32b8144 FG	250	typename OutputIterator
	251	>
	252	inline OutputIterator difference_insert(Geometry1 const& geometry1,
	253	Geometry2 const& geometry2,
b32b8144 FG	254	OutputIterator out)
	255	{
	256	typedef typename strategy::relate::services::default_strategy
	257	<
	258	Geometry1,
	259	Geometry2
	260	>::type strategy_type;
	261
92f5a8d4 TL	262	return difference_insert<GeometryOut>(geometry1, geometry2, out,
92f5a8d4 TL	263	strategy_type());
b32b8144 FG	264	}
	265
	266
	267	}} // namespace detail::difference
	268	#endif // DOXYGEN_NO_DETAIL
	269
	270
	271	namespace resolve_strategy {
	272
	273	struct difference
	274	{
	275	template
	276	<
	277	typename Geometry1,
	278	typename Geometry2,
b32b8144 FG	279	typename Collection,
	280	typename Strategy
	281	>
	282	static inline void apply(Geometry1 const& geometry1,
	283	Geometry2 const& geometry2,
b32b8144 FG	284	Collection & output_collection,
	285	Strategy const& strategy)
	286	{
20effc67 TL	287	typedef typename geometry::detail::output_geometry_value
	288	<
	289	Collection
	290	>::type single_out;
b32b8144	291
20effc67	292	detail::difference::difference_insert<single_out>(
92f5a8d4	293	geometry1, geometry2,
20effc67	294	geometry::detail::output_geometry_back_inserter(output_collection),
b32b8144 FG	295	strategy);
	296	}
	297
	298	template
	299	<
	300	typename Geometry1,
	301	typename Geometry2,
b32b8144 FG	302	typename Collection
	303	>
	304	static inline void apply(Geometry1 const& geometry1,
	305	Geometry2 const& geometry2,
b32b8144 FG	306	Collection & output_collection,
	307	default_strategy)
	308	{
20effc67 TL	309	typedef typename strategy::relate::services::default_strategy
	310	<
	311	Geometry1,
	312	Geometry2
	313	>::type strategy_type;
b32b8144	314
20effc67	315	apply(geometry1, geometry2, output_collection, strategy_type());
b32b8144 FG	316	}
	317	};
	318
	319	} // resolve_strategy
	320
	321
	322	namespace resolve_variant
	323	{
	324
	325	template <typename Geometry1, typename Geometry2>
	326	struct difference
	327	{
	328	template <typename Collection, typename Strategy>
	329	static inline void apply(Geometry1 const& geometry1,
	330	Geometry2 const& geometry2,
	331	Collection& output_collection,
	332	Strategy const& strategy)
	333	{
b32b8144	334	resolve_strategy::difference::apply(geometry1, geometry2,
b32b8144 FG	335	output_collection,
	336	strategy);
	337	}
	338	};
	339
	340
	341	template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Geometry2>
	342	struct difference<variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Geometry2>
	343	{
	344	template <typename Collection, typename Strategy>
	345	struct visitor: static_visitor<>
	346	{
	347	Geometry2 const& m_geometry2;
	348	Collection& m_output_collection;
	349	Strategy const& m_strategy;
	350
	351	visitor(Geometry2 const& geometry2,
	352	Collection& output_collection,
	353	Strategy const& strategy)
	354	: m_geometry2(geometry2)
	355	, m_output_collection(output_collection)
	356	, m_strategy(strategy)
	357	{}
	358
	359	template <typename Geometry1>
	360	void operator()(Geometry1 const& geometry1) const
	361	{
	362	difference
	363	<
	364	Geometry1,
	365	Geometry2
	366	>::apply(geometry1, m_geometry2, m_output_collection, m_strategy);
	367	}
	368	};
	369
	370	template <typename Collection, typename Strategy>
	371	static inline void
	372	apply(variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry1,
	373	Geometry2 const& geometry2,
	374	Collection& output_collection,
	375	Strategy const& strategy)
	376	{
	377	boost::apply_visitor(visitor<Collection, Strategy>(geometry2,
	378	output_collection,
	379	strategy),
	380	geometry1);
	381	}
	382	};
	383
	384
	385	template <typename Geometry1, BOOST_VARIANT_ENUM_PARAMS(typename T)>
	386	struct difference<Geometry1, variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
	387	{
	388	template <typename Collection, typename Strategy>
	389	struct visitor: static_visitor<>
	390	{
	391	Geometry1 const& m_geometry1;
	392	Collection& m_output_collection;
	393	Strategy const& m_strategy;
	394
	395	visitor(Geometry1 const& geometry1,
	396	Collection& output_collection,
	397	Strategy const& strategy)
	398	: m_geometry1(geometry1)
399	, m_output_collection(output_collection)
400	, m_strategy(strategy)
401	{}
402
403	template <typename Geometry2>
404	void operator()(Geometry2 const& geometry2) const
405	{
406	difference
407	<
408	Geometry1,
409	Geometry2
410	>::apply(m_geometry1, geometry2, m_output_collection, m_strategy);
411	}
412	};
413
414	template <typename Collection, typename Strategy>
415	static inline void
416	apply(Geometry1 const& geometry1,
417	variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry2,
418	Collection& output_collection,
419	Strategy const& strategy)
420	{
421	boost::apply_visitor(visitor<Collection, Strategy>(geometry1,
422	output_collection,
423	strategy),
424	geometry2);
425	}
426	};
427
428
429	template <BOOST_VARIANT_ENUM_PARAMS(typename T1), BOOST_VARIANT_ENUM_PARAMS(typename T2)>
430	struct difference<variant<BOOST_VARIANT_ENUM_PARAMS(T1)>, variant<BOOST_VARIANT_ENUM_PARAMS(T2)> >
431	{
432	template <typename Collection, typename Strategy>
433	struct visitor: static_visitor<>
434	{
435	Collection& m_output_collection;
436	Strategy const& m_strategy;
437
438	visitor(Collection& output_collection, Strategy const& strategy)
439	: m_output_collection(output_collection)
440	, m_strategy(strategy)
441	{}
442
443	template <typename Geometry1, typename Geometry2>
444	void operator()(Geometry1 const& geometry1,
445	Geometry2 const& geometry2) const
446	{
447	difference
448	<
449	Geometry1,
450	Geometry2
451	>::apply(geometry1, geometry2, m_output_collection, m_strategy);
452	}
453	};
454
455	template <typename Collection, typename Strategy>
456	static inline void
457	apply(variant<BOOST_VARIANT_ENUM_PARAMS(T1)> const& geometry1,
458	variant<BOOST_VARIANT_ENUM_PARAMS(T2)> const& geometry2,
459	Collection& output_collection,
460	Strategy const& strategy)
461	{
462	boost::apply_visitor(visitor<Collection, Strategy>(output_collection,
463	strategy),
464	geometry1, geometry2);
465	}
466	};
467
468	} // namespace resolve_variant
469
470
471	/*!
472	\brief_calc2{difference}
473	\ingroup difference
474	\details \details_calc2{difference, spatial set theoretic difference}.
475	\tparam Geometry1 \tparam_geometry
476	\tparam Geometry2 \tparam_geometry
477	\tparam Collection \tparam_output_collection
478	\tparam Strategy \tparam_strategy{Difference}
479	\param geometry1 \param_geometry
480	\param geometry2 \param_geometry
481	\param output_collection the output collection
482	\param strategy \param_strategy{difference}
483
484	\qbk{distinguish,with strategy}
485	\qbk{[include reference/algorithms/difference.qbk]}
486	*/
487	template
488	<
489	typename Geometry1,
490	typename Geometry2,
491	typename Collection,
492	typename Strategy
493	>
494	inline void difference(Geometry1 const& geometry1,
495	Geometry2 const& geometry2,
496	Collection& output_collection,
497	Strategy const& strategy)
498	{
499	resolve_variant::difference
500	<
501	Geometry1,
502	Geometry2
503	>::apply(geometry1, geometry2, output_collection, strategy);
504	}
505
506
507	/*!
508	\brief_calc2{difference}
509	\ingroup difference
510	\details \details_calc2{difference, spatial set theoretic difference}.
511	\tparam Geometry1 \tparam_geometry
512	\tparam Geometry2 \tparam_geometry
513	\tparam Collection \tparam_output_collection
514	\param geometry1 \param_geometry
515	\param geometry2 \param_geometry
516	\param output_collection the output collection
517
518	\qbk{[include reference/algorithms/difference.qbk]}
519	*/
520	template
521	<
522	typename Geometry1,
523	typename Geometry2,
524	typename Collection
525	>
526	inline void difference(Geometry1 const& geometry1,
527	Geometry2 const& geometry2,
528	Collection& output_collection)
529	{
530	resolve_variant::difference
531	<
532	Geometry1,
533	Geometry2
534	>::apply(geometry1, geometry2, output_collection, default_strategy());
535	}
536
537
538	}} // namespace boost::geometry
539
540
541	#endif // BOOST_GEOMETRY_ALGORITHMS_DIFFERENCE_HPP