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/* This file is part of the Gudhi Library. The Gudhi library
* (Geometric Understanding in Higher Dimensions) is a generic C++
* library for computational topology.
*
* Author(s): David Salinas
*
* Copyright (C) 2014 Inria
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_EDGES_ITERATORS_H_
#define SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_EDGES_ITERATORS_H_
#include <boost/iterator/iterator_facade.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <utility> // for pair<>
namespace Gudhi {
namespace skeleton_blocker {
template<typename SkeletonBlockerComplex>
class Edge_around_vertex_iterator : public boost::iterator_facade <Edge_around_vertex_iterator<SkeletonBlockerComplex>
, typename SkeletonBlockerComplex::Edge_handle const, boost::forward_traversal_tag
, typename SkeletonBlockerComplex::Edge_handle const> {
friend class boost::iterator_core_access;
typedef SkeletonBlockerComplex Complex;
typedef typename Complex::boost_adjacency_iterator boost_adjacency_iterator;
typedef typename Complex::Vertex_handle Vertex_handle;
typedef typename Complex::Edge_handle Edge_handle;
private:
const Complex* complex;
Vertex_handle v;
boost_adjacency_iterator current_;
boost_adjacency_iterator end_;
public:
Edge_around_vertex_iterator() : complex(NULL) { }
Edge_around_vertex_iterator(const Complex* complex_, Vertex_handle v_) :
complex(complex_),
v(v_) {
tie(current_, end_) = adjacent_vertices(v.vertex, complex->skeleton);
}
/**
* returns an iterator to the end
*/
Edge_around_vertex_iterator(const Complex* complex_, Vertex_handle v_, int end) :
complex(complex_),
v(v_) {
tie(current_, end_) = adjacent_vertices(v.vertex, complex->skeleton);
set_end();
}
bool equal(const Edge_around_vertex_iterator& other) const {
return (complex == other.complex) && (v == other.v) && (current_ == other.current_) && (end_ == other.end_);
}
void increment() {
if (current_ != end_)
++current_;
}
Edge_handle dereference() const {
return *(*complex)[std::make_pair(v, static_cast<Vertex_handle> (*current_))];
}
private:
// remove this ugly hack
void set_end() {
current_ = end_;
}
};
/**
*@brief Iterator on the edges of a simplicial complex.
*
*/
template<typename SkeletonBlockerComplex>
class Edge_iterator : public boost::iterator_facade <Edge_iterator<SkeletonBlockerComplex>
, typename SkeletonBlockerComplex::Edge_handle const
, boost::forward_traversal_tag
, typename SkeletonBlockerComplex::Edge_handle const> {
friend class boost::iterator_core_access;
public:
typedef SkeletonBlockerComplex Complex;
typedef typename Complex::boost_edge_iterator boost_edge_iterator;
typedef typename Complex::Edge_handle Edge_handle;
const Complex* complex;
std::pair<boost_edge_iterator, boost_edge_iterator> edge_iterator;
Edge_iterator() : complex(NULL) { }
Edge_iterator(const SkeletonBlockerComplex* complex_) :
complex(complex_),
edge_iterator(boost::edges(complex_->skeleton)) { }
/**
* return an iterator to the end
*/
Edge_iterator(const SkeletonBlockerComplex* complex_, int end) :
complex(complex_),
edge_iterator(boost::edges(complex_->skeleton)) {
edge_iterator.first = edge_iterator.second;
}
bool equal(const Edge_iterator& other) const {
return (complex == other.complex) && (edge_iterator == other.edge_iterator);
}
void increment() {
if (edge_iterator.first != edge_iterator.second) {
++(edge_iterator.first);
}
}
Edge_handle dereference() const {
return (*(edge_iterator.first));
}
};
} // namespace skeleton_blocker
namespace skbl = skeleton_blocker;
} // namespace Gudhi
#endif // SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_EDGES_ITERATORS_H_
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