153 lines
4.7 KiB
C++
Executable File
153 lines
4.7 KiB
C++
Executable File
// Copyright (c) 2003, 2017 INRIA Sophia-Antipolis (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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// You can redistribute it and/or modify it under the terms of the GNU
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// General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: GPL-3.0+
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//
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// Author(s) : Julia Floetotto
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#ifndef CGAL_INTERPOLATION_INTERNAL_HELPERS_H
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#define CGAL_INTERPOLATION_INTERNAL_HELPERS_H
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#include <CGAL/license/Interpolation.h>
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#include <CGAL/assertions.h>
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#include <utility>
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namespace CGAL {
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namespace Interpolation {
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namespace internal {
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// Extracts the bare point from a weighted point or a vertex handle (and identity
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// if the argument is a bare point)
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template < typename InterpolationTraits_ >
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struct Extract_bare_point
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{
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typedef InterpolationTraits_ Traits;
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typedef typename Traits::Point_d Point;
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typedef typename Traits::Weighted_point_d Weighted_point;
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Extract_bare_point(const Traits& traits = Traits()) : traits(traits) {}
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const Point& operator()(const Point& p) const { return p; }
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Point operator()(const Weighted_point& wp) const {
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return traits.construct_point_d_object()(wp);
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}
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template <typename VH>
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Point operator()(const VH& vh) const {
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CGAL_precondition(vh != VH());
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return traits.construct_point_d_object()(vh->point());
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}
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private:
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Traits traits;
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};
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// Converts a pair<Triangulation_::Vertex_handle, T2_>
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// into a pair<Triangulation_::Point, T2_>
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template < typename Triangulation_, typename T2_ >
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struct Extract_point_in_pair
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{
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typedef Triangulation_ Tr;
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typedef T2_ T2;
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typedef typename Tr::Vertex_handle Vertex_handle;
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typedef typename Tr::Point Point; // possibly weighted
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typedef std::pair<Vertex_handle, T2> argument_type;
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typedef std::pair<Point, T2> result_type;
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result_type operator()(const argument_type& vp) const
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{
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CGAL_precondition(vp.first != Vertex_handle());
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return std::make_pair(vp.first->point(), vp.second);
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}
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};
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// Given a map `m` of type `Map`, transforms an object of type `pair<Map::key_type, T2>`
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// into an object of type `pair<Map::mapped_type, T2>`, using the `m`.
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//
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template < typename Map_, typename T2_ >
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struct Pair_mapper
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{
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typedef Map_ Map;
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typedef T2_ T2;
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typedef typename Map::key_type Map_key_type;
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typedef typename Map::mapped_type Map_mapped_type;
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typedef std::pair<Map_key_type, T2> argument_type;
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typedef std::pair<Map_mapped_type, T2> result_type;
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const Map& map;
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Pair_mapper(const Map& map) : map(map) {}
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result_type operator()(const argument_type& vp) const
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{
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typename Map::const_iterator it = map.find(vp.first);
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CGAL_assertion(it != map.end());
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return std::make_pair(it->second, vp.second);
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}
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};
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// The struct "Project_vertex_output_iterator" is used in natural_neighbor_coordinates_2,
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// as well as in regular_neighbor_coordinates_2, and in surface_neighbor_coordinates_3.
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//
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// It wraps the OutputIterator with value type `std::pair<Vertex_handle, T2>`
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// into an output iterator with value type `OutputFunctor::result_type`.
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//
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// \pre OutputIterator has value type std::pair<Vertex_handle, T>
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// \pre Vertex_handle has a function ->point() with return type const Point&
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// \pre OutputIterator::value_type == OutputFunctor::argument_type
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template < class OutputIterator, class OutputFunctor >
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struct Project_vertex_output_iterator
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{
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OutputIterator out;
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OutputFunctor fct;
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//creation:
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Project_vertex_output_iterator(OutputIterator o, OutputFunctor f)
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: out(o), fct(f)
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{}
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OutputIterator base() {return out;}
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Project_vertex_output_iterator& operator++(){out++; return *this;}
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Project_vertex_output_iterator& operator++(int){out++; return *this;}
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Project_vertex_output_iterator& operator*(){return *this;}
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template<class Vertex_pair>
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Project_vertex_output_iterator& operator=(const Vertex_pair& vp)
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{
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*out = fct(vp);
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return *this;
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}
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};
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} // namespace internal
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} // namespace Interpolation
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} // namespace CGAL
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#endif // CGAL_INTERPOLATION_INTERNAL_HELPERS_H
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