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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.

// This file was modified by Oracle on 2015.
// Modifications copyright (c) 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.

// Distributed under 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_ENVELOPE_INTERFACE_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_INTERFACE_HPP

#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/envelope.hpp>


namespace boost { namespace geometry
{

namespace resolve_variant
{

template <typename Geometry>
struct envelope
{
    template <typename Box>
    static inline void apply(Geometry const& geometry, Box& box)
    {
        concepts::check<Geometry const>();
        concepts::check<Box>();

        dispatch::envelope<Geometry>::apply(geometry, box);
    }
};

template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct envelope<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
    template <typename Box>
    struct visitor: boost::static_visitor<void>
    {
        Box& m_box;

        visitor(Box& box): m_box(box) {}

        template <typename Geometry>
        void operator()(Geometry const& geometry) const
        {
            envelope<Geometry>::apply(geometry, m_box);
        }
    };

    template <typename Box>
    static inline void
    apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry,
          Box& box)
    {
        boost::apply_visitor(visitor<Box>(box), geometry);
    }
};

} // namespace resolve_variant


/*!
\brief \brief_calc{envelope}
\ingroup envelope
\details \details_calc{envelope,\det_envelope}.
\tparam Geometry \tparam_geometry
\tparam Box \tparam_box
\param geometry \param_geometry
\param mbr \param_box \param_set{envelope}

\qbk{[include reference/algorithms/envelope.qbk]}
\qbk{
[heading Example]
[envelope] [envelope_output]
}
*/
template<typename Geometry, typename Box>
inline void envelope(Geometry const& geometry, Box& mbr)
{
    resolve_variant::envelope<Geometry>::apply(geometry, mbr);
}


/*!
\brief \brief_calc{envelope}
\ingroup envelope
\details \details_calc{return_envelope,\det_envelope}. \details_return{envelope}
\tparam Box \tparam_box
\tparam Geometry \tparam_geometry
\param geometry \param_geometry
\return \return_calc{envelope}

\qbk{[include reference/algorithms/envelope.qbk]}
\qbk{
[heading Example]
[return_envelope] [return_envelope_output]
}
*/
template<typename Box, typename Geometry>
inline Box return_envelope(Geometry const& geometry)
{
    Box mbr;
    resolve_variant::envelope<Geometry>::apply(geometry, mbr);
    return mbr;
}

}} // namespace boost::geometry

#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_INTERFACE_HPP