Size_range.h
1 /* This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
2  * See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
3  * Author(s): Siargey Kachanovich
4  *
5  * Copyright (C) 2019 Inria
6  *
7  * Modification(s):
8  * - YYYY/MM Author: Description of the modification
9  */
10 
11 #ifndef PERMUTAHEDRAL_REPRESENTATION_SIZE_RANGE_H_
12 #define PERMUTAHEDRAL_REPRESENTATION_SIZE_RANGE_H_
13 
14 #include <cstdlib> // for std::size_t
15 
16 #include <boost/range/iterator_range.hpp>
17 
18 namespace Gudhi {
19 
20 namespace coxeter_triangulation {
21 
24 template <class T_it>
26  : public boost::iterator_facade<Size_iterator<T_it>, std::size_t const, boost::forward_traversal_tag> {
27  friend class boost::iterator_core_access;
28 
29  private:
30  bool equal(Size_iterator const& other) const { return (is_end_ && other.is_end_); }
31 
32  std::size_t const& dereference() const { return value_; }
33 
34  void increment() {
35  if (++t_it_ == t_end_) {
36  is_end_ = true;
37  return;
38  }
39  value_ = t_it_->size() - 1;
40  }
41 
42  public:
43  Size_iterator(const T_it& t_begin, const T_it& t_end) : t_it_(t_begin), t_end_(t_end), is_end_(t_begin == t_end) {
44  if (!is_end_) value_ = t_it_->size() - 1;
45  }
46 
47  private:
48  T_it t_it_, t_end_;
49  bool is_end_;
50  std::size_t value_;
51 };
52 
53 template <class T>
54 class Size_range {
55  const T& t_;
56 
57  public:
59 
60  Size_range(const T& t) : t_(t) {}
61 
62  std::size_t operator[](std::size_t i) const { return t_[i].size() - 1; }
63 
64  iterator begin() const { return iterator(t_.begin(), t_.end()); }
65 
66  iterator end() const { return iterator(t_.end(), t_.end()); }
67 };
68 
69 } // namespace coxeter_triangulation
70 
71 } // namespace Gudhi
72 
73 #endif
Auxillary iterator class for sizes of parts in an ordered set partition.
Definition: Size_range.h:26
GUDHIdev  Version 3.5.0  - C++ library for Topological Data Analysis (TDA) and Higher Dimensional Geometry Understanding.  - Copyright : MIT Generated on Tue Aug 16 2022 14:01:50 for GUDHIdev by Doxygen 1.9.1