File isHalfEdge.h

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// Copyright (c) 2012-2013, IGN France.
// Copyright (c) 2012-2022, Oslandia.
// SPDX-License-Identifier: LGPL-2.0-or-later

#ifndef _SFCGAL_GRAPH_ALGORITHM_ISCONNECTED_H_
#define _SFCGAL_GRAPH_ALGORITHM_ISCONNECTED_H_

#include <complex>
#include <set>

#include "SFCGAL/detail/ComplexComparator.h"

#include "SFCGAL/detail/graph/GeometryGraph.h"

#include <boost/graph/connected_components.hpp>
#include <boost/graph/copy.hpp>

namespace SFCGAL {
namespace graph {
namespace algorithm {

template <typename V, typename E>
bool
isHalfEdge(const GeometryGraphT<V, E> &graph)
{
  typedef typename GeometryGraphT<V, E>::vertex_descriptor vertex_descriptor;
  // typedef typename GeometryGraphT<V,E>::edge_descriptor   edge_descriptor ;
  typedef typename GeometryGraphT<V, E>::edge_iterator edge_iterator;

  /*
   * try to insert all edges in a map, return false if an edge already exists
   * (i.e. there are parallel edges)
   */
  std::set<std::complex<vertex_descriptor>, detail::ComplexComparator> edges;
  edge_iterator                                                        it, end;

  for (boost::tie(it, end) = graph.edges(); it != end; ++it) {
    std::complex<vertex_descriptor> cedge(graph.source(*it), graph.target(*it));

    if (edges.find(cedge) != edges.end()) {
      return false;
    } else {
      edges.insert(cedge);
    }
  }

  return true;
}

} // namespace algorithm
} // namespace graph
} // namespace SFCGAL

#endif