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

// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
// Copyright (c) 2013-2014 Adam Wulkiewicz, Lodz, Poland.

// This file was modified by Oracle on 2013-2014.
// Modifications copyright (c) 2013-2014, Oracle and/or its affiliates.

// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// 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_ALGORITHMS_DETAIL_DISJOINT_INTERFACE_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISJOINT_INTERFACE_HPP

#include <cstddef>

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

#include <boost/geometry/geometries/concepts/check.hpp>

#include <boost/geometry/algorithms/dispatch/disjoint.hpp>


namespace boost { namespace geometry
{


#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{


// If reversal is needed, perform it
template
<
    typename Geometry1, typename Geometry2,
    std::size_t DimensionCount,
    typename Tag1, typename Tag2
>
struct disjoint<Geometry1, Geometry2, DimensionCount, Tag1, Tag2, true>
{
    static inline bool apply(Geometry1 const& g1, Geometry2 const& g2)
    {
        return disjoint
            <
                Geometry2, Geometry1,
                DimensionCount,
                Tag2, Tag1
            >::apply(g2, g1);
    }
};


} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH


namespace resolve_variant {

template <typename Geometry1, typename Geometry2>
struct disjoint
{
    static inline bool apply(Geometry1 const& geometry1, Geometry2 const& geometry2)
    {
        concepts::check_concepts_and_equal_dimensions
            <
                Geometry1 const,
                Geometry2 const
            >();

        return dispatch::disjoint<Geometry1, Geometry2>::apply(geometry1, geometry2);
    }
};

template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Geometry2>
struct disjoint<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Geometry2>
{
    struct visitor: boost::static_visitor<bool>
    {
        Geometry2 const& m_geometry2;

        visitor(Geometry2 const& geometry2): m_geometry2(geometry2) {}

        template <typename Geometry1>
        bool operator()(Geometry1 const& geometry1) const
        {
            return disjoint<Geometry1, Geometry2>::apply(geometry1, m_geometry2);
        }
    };

    static inline bool
    apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry1,
          Geometry2 const& geometry2)
    {
        return boost::apply_visitor(visitor(geometry2), geometry1);
    }
};

template <typename Geometry1, BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct disjoint<Geometry1, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
    struct visitor: boost::static_visitor<bool>
    {
        Geometry1 const& m_geometry1;

        visitor(Geometry1 const& geometry1): m_geometry1(geometry1) {}

        template <typename Geometry2>
        bool operator()(Geometry2 const& geometry2) const
        {
            return disjoint<Geometry1, Geometry2>::apply(m_geometry1, geometry2);
        }
    };

    static inline bool
    apply(Geometry1 const& geometry1,
          boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry2)
    {
        return boost::apply_visitor(visitor(geometry1), geometry2);
    }
};

template <
    BOOST_VARIANT_ENUM_PARAMS(typename T1),
    BOOST_VARIANT_ENUM_PARAMS(typename T2)
>
struct disjoint<
    boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)>,
    boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)>
>
{
    struct visitor: boost::static_visitor<bool>
    {
        template <typename Geometry1, typename Geometry2>
        bool operator()(Geometry1 const& geometry1,
                        Geometry2 const& geometry2) const
        {
            return disjoint<Geometry1, Geometry2>::apply(geometry1, geometry2);
        }
    };

    static inline bool
    apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)> const& geometry1,
          boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)> const& geometry2)
    {
        return boost::apply_visitor(visitor(), geometry1, geometry2);
    }
};

} // namespace resolve_variant



/*!
\brief \brief_check2{are disjoint}
\ingroup disjoint
\tparam Geometry1 \tparam_geometry
\tparam Geometry2 \tparam_geometry
\param geometry1 \param_geometry
\param geometry2 \param_geometry
\return \return_check2{are disjoint}

\qbk{[include reference/algorithms/disjoint.qbk]}
*/
template <typename Geometry1, typename Geometry2>
inline bool disjoint(Geometry1 const& geometry1,
                     Geometry2 const& geometry2)
{
    return resolve_variant::disjoint<Geometry1, Geometry2>::apply(geometry1, geometry2);
}


}} // namespace boost::geometry


#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISJOINT_INTERFACE_HPP
