77 lines
4.0 KiB
C++
77 lines
4.0 KiB
C++
/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2023 ISciences, LLC
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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**********************************************************************/
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#pragma once
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#include <geos/geom/Coordinate.h>
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#include <geos/geom/CoordinateSequence.h>
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namespace geos {
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namespace geom {
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///
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/// \brief The CoordinateSequences class provides utility methods to operate
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/// on CoordinateSequences. Methods that do not benefit from access to the
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/// CoordinateSequence internals can be placed here.
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///
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class CoordinateSequences {
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private:
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template<typename CoordinateType>
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static constexpr int
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type_pair(const CoordinateType& typ1, const CoordinateType& typ2) {
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return (static_cast<int>(typ1) << 4) | static_cast<int>(typ2);
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}
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public:
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///
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/// \brief binaryDispatch calls a functor template, explicitly providing the backing types of two CoordinateSequences. The
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/// CoordinateSequences are not provided to the functor as arguments but can be provided along with any other arguments
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/// through the `args` argument.
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template<typename F, class... Args>
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static void binaryDispatch(const CoordinateSequence& seq1, const CoordinateSequence& seq2, F& fun, Args... args)
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{
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using CoordinateXYZ = Coordinate;
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auto typ1 = seq1.getCoordinateType();
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auto typ2 = seq2.getCoordinateType();
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switch(type_pair(typ1, typ2)) {
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case type_pair(CoordinateType::XY, CoordinateType::XY): fun.template operator()<CoordinateXY, CoordinateXY>(args...); break;
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case type_pair(CoordinateType::XY, CoordinateType::XYZ): fun.template operator()<CoordinateXY, CoordinateXYZ>(args...); break;
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case type_pair(CoordinateType::XY, CoordinateType::XYM): fun.template operator()<CoordinateXY, CoordinateXYM>(args...); break;
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case type_pair(CoordinateType::XY, CoordinateType::XYZM): fun.template operator()<CoordinateXY, CoordinateXYZM>(args...); break;
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case type_pair(CoordinateType::XYZ, CoordinateType::XY): fun.template operator()<CoordinateXYZ, CoordinateXY>(args...); break;
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case type_pair(CoordinateType::XYZ, CoordinateType::XYZ): fun.template operator()<CoordinateXYZ, CoordinateXYZ>(args...); break;
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case type_pair(CoordinateType::XYZ, CoordinateType::XYM): fun.template operator()<CoordinateXYZ, CoordinateXYM>(args...); break;
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case type_pair(CoordinateType::XYZ, CoordinateType::XYZM): fun.template operator()<CoordinateXYZ, CoordinateXYZM>(args...); break;
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case type_pair(CoordinateType::XYM, CoordinateType::XY): fun.template operator()<CoordinateXYM, CoordinateXY>(args...); break;
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case type_pair(CoordinateType::XYM, CoordinateType::XYZ): fun.template operator()<CoordinateXYM, CoordinateXYZ>(args...); break;
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case type_pair(CoordinateType::XYM, CoordinateType::XYM): fun.template operator()<CoordinateXYM, CoordinateXYM>(args...); break;
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case type_pair(CoordinateType::XYM, CoordinateType::XYZM): fun.template operator()<CoordinateXYM, CoordinateXYZM>(args...); break;
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case type_pair(CoordinateType::XYZM, CoordinateType::XY): fun.template operator()<CoordinateXYZM, CoordinateXY>(args...); break;
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case type_pair(CoordinateType::XYZM, CoordinateType::XYZ): fun.template operator()<CoordinateXYZM, CoordinateXYZ>(args...); break;
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case type_pair(CoordinateType::XYZM, CoordinateType::XYM): fun.template operator()<CoordinateXYZM, CoordinateXYM>(args...); break;
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case type_pair(CoordinateType::XYZM, CoordinateType::XYZM): fun.template operator()<CoordinateXYZM, CoordinateXYZM>(args...); break;
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}
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}
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};
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}
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}
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