134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK.
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_MULTI_ALGORITHMS_CONVERT_HPP
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#define BOOST_GEOMETRY_MULTI_ALGORITHMS_CONVERT_HPP
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#include <boost/range/metafunctions.hpp>
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#include <boost/geometry/algorithms/convert.hpp>
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#include <boost/geometry/multi/core/tags.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace conversion
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{
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template <typename Single, typename Multi, typename Policy>
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struct single_to_multi
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{
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static inline void apply(Single const& single, Multi& multi)
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{
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traits::resize<Multi>::apply(multi, 1);
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Policy::apply(single, *boost::begin(multi));
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}
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};
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template <typename Multi1, typename Multi2, typename Policy>
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struct multi_to_multi
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{
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static inline void apply(Multi1 const& multi1, Multi2& multi2)
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{
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traits::resize<Multi2>::apply(multi2, boost::size(multi1));
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typename boost::range_iterator<Multi1 const>::type it1
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= boost::begin(multi1);
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typename boost::range_iterator<Multi2>::type it2
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= boost::begin(multi2);
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for (; it1 != boost::end(multi1); ++it1, ++it2)
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{
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Policy::apply(*it1, *it2);
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}
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}
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};
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}} // namespace detail::convert
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#endif // DOXYGEN_NO_DETAIL
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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// Dispatch for multi <-> multi, specifying their single-version as policy.
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// Note that, even if the multi-types are mutually different, their single
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// version types might be the same and therefore we call boost::is_same again
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template <std::size_t DimensionCount, typename Multi1, typename Multi2>
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struct convert<false, multi_tag, multi_tag, DimensionCount, Multi1, Multi2>
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: detail::conversion::multi_to_multi
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<
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Multi1,
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Multi2,
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convert
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<
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boost::is_same
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<
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typename boost::range_value<Multi1>::type,
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typename boost::range_value<Multi2>::type
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>::value,
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typename single_tag_of
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<
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typename tag<Multi1>::type
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>::type,
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typename single_tag_of
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<
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typename tag<Multi2>::type
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>::type,
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DimensionCount,
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typename boost::range_value<Multi1>::type,
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typename boost::range_value<Multi2>::type
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>
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>
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{};
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template <std::size_t DimensionCount, typename SingleTag, typename Single, typename Multi>
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struct convert<false, SingleTag, multi_tag, DimensionCount, Single, Multi>
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: detail::conversion::single_to_multi
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<
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Single,
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Multi,
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convert
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<
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false,
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typename tag<Single>::type,
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typename single_tag_of
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<
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typename tag<Multi>::type
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>::type,
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DimensionCount,
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Single,
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typename boost::range_value<Multi>::type
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>
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>
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{};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_MULTI_ALGORITHMS_CONVERT_HPP
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