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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
*
* Modification(s):
* - YYYY/MM Author: Description of the modification
*/
#ifndef SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_VERTICES_ITERATORS_H_
#define SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_VERTICES_ITERATORS_H_
#include <boost/iterator/iterator_facade.hpp>
#include <utility> // for pair<>
namespace Gudhi {
namespace skeleton_blocker {
/**
*@brief Iterator on the vertices of a simplicial complex
*@remark The increment operator go to the next active vertex.
*@remark Incrementation increases Vertex_handle.
*/
template<typename SkeletonBlockerComplex>
class Vertex_iterator : public boost::iterator_facade< Vertex_iterator <SkeletonBlockerComplex>
, typename SkeletonBlockerComplex::Vertex_handle const
, boost::forward_traversal_tag
, typename SkeletonBlockerComplex::Vertex_handle const> {
friend class boost::iterator_core_access;
typedef typename SkeletonBlockerComplex::boost_vertex_iterator boost_vertex_iterator;
typedef typename SkeletonBlockerComplex::Vertex_handle Vertex_handle;
private:
const SkeletonBlockerComplex* complex;
std::pair<boost_vertex_iterator, boost_vertex_iterator> vertexIterator;
public:
Vertex_iterator() : complex(NULL) { }
Vertex_iterator(const SkeletonBlockerComplex* complex_) :
complex(complex_),
vertexIterator(vertices(complex_->skeleton)) {
if (!finished() && !is_active()) {
goto_next_valid();
}
}
/**
* return an iterator to the end.
*/
Vertex_iterator(const SkeletonBlockerComplex* complex_, int end) :
complex(complex_), vertexIterator(vertices(complex_->skeleton)) {
vertexIterator.first = vertexIterator.second;
}
public:
void increment() {
goto_next_valid();
}
Vertex_handle dereference() const {
return (Vertex_handle(*(vertexIterator.first)));
}
bool equal(const Vertex_iterator& other) const {
return vertexIterator == other.vertexIterator && complex == other.complex;
}
bool operator<(const Vertex_iterator& other) const {
return dereference() < other.dereference();
}
private:
bool finished() const {
return vertexIterator.first == vertexIterator.second;
}
void goto_next_valid() {
++vertexIterator.first;
if (!finished() && !is_active()) {
goto_next_valid();
}
}
bool is_active() const {
return ((*complex)[Vertex_handle(*vertexIterator.first)]).is_active();
}
};
template<typename SkeletonBlockerComplex>
class Neighbors_vertices_iterator : public boost::iterator_facade < Neighbors_vertices_iterator<SkeletonBlockerComplex>
, typename SkeletonBlockerComplex::Vertex_handle const
, boost::forward_traversal_tag
, typename SkeletonBlockerComplex::Vertex_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:
Neighbors_vertices_iterator() : complex(NULL) { }
Neighbors_vertices_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
*/
Neighbors_vertices_iterator(const Complex* complex_, Vertex_handle v_, int end) :
complex(complex_),
v(v_) {
tie(current_, end_) = adjacent_vertices(v.vertex, complex->skeleton);
set_end();
}
void increment() {
if (current_ != end_)
++current_;
}
Vertex_handle dereference() const {
return (Vertex_handle(*current_));
}
bool equal(const Neighbors_vertices_iterator& other) const {
return (complex == other.complex) && (v == other.v) && (current_ == other.current_) && (end_ == other.end_);
}
private:
// TODO(DS): remove this ugly hack
void set_end() {
current_ = end_;
}
};
} // namespace skeleton_blocker
namespace skbl = skeleton_blocker;
} // namespace Gudhi
#endif // SKELETON_BLOCKER_ITERATORS_SKELETON_BLOCKERS_VERTICES_ITERATORS_H_
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