CARLA
Iterator.h
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1 // Copyright (c) 2017 Computer Vision Center (CVC) at the Universitat Autonoma
2 // de Barcelona (UAB).
3 //
4 // This work is licensed under the terms of the MIT license.
5 // For a copy, see <https://opensource.org/licenses/MIT>.
6 
7 #pragma once
8 
9 #include <boost/iterator/transform_iterator.hpp>
10 
11 namespace carla {
12 namespace iterator {
13 
14  /// Creates an iterator over non-const references to the keys of a map.
15  template <typename It>
16  inline static auto make_map_keys_iterator(It it) {
17  using first_value_type = typename It::value_type::first_type;
18  using decay_first_value_type = typename std::remove_cv_t<typename std::remove_reference_t<first_value_type>>;
19  using ref_to_first = decay_first_value_type &;
20  return boost::make_transform_iterator(it, [](auto &pair) -> ref_to_first { return pair.first; });
21  }
22 
23  /// Creates an iterator over const references to the keys of a map.
24  template <typename It>
25  inline static auto make_map_keys_const_iterator(It it) {
26  using first_value_type = typename It::value_type::first_type;
27  using decay_first_value_type = typename std::remove_cv_t<typename std::remove_reference_t<first_value_type>>;
28  using const_ref_to_first = const decay_first_value_type &;
29  return boost::make_transform_iterator(it, [](const auto &pair) -> const_ref_to_first { return pair.first; });
30  }
31 
32  /// Creates an iterator over non-const references to the values of a map.
33  template <typename It>
34  inline static auto make_map_values_iterator(It it) {
35  using second_value_type = typename It::value_type::second_type;
36  using decay_second_value_type = typename std::remove_cv_t<typename std::remove_reference_t<second_value_type>>;
37  using ref_to_second = decay_second_value_type &;
38  return boost::make_transform_iterator(it, [](auto &pair) -> ref_to_second { return pair.second; });
39  }
40 
41  /// Creates an iterator over const references to the values of a map.
42  template <typename It>
43  inline static auto make_map_values_const_iterator(It it) {
44  using second_value_type = typename It::value_type::second_type;
45  using decay_second_value_type = typename std::remove_cv_t<typename std::remove_reference_t<second_value_type>>;
46  using const_ref_to_second = const decay_second_value_type &;
47  return boost::make_transform_iterator(it, [](const auto &pair) -> const_ref_to_second { return pair.second; });
48  }
49 
50 } // namespace iterator
51 } // namespace carla
static auto make_map_keys_iterator(It it)
Creates an iterator over non-const references to the keys of a map.
Definition: Iterator.h:16
static auto make_map_values_iterator(It it)
Creates an iterator over non-const references to the values of a map.
Definition: Iterator.h:34
This file contains definitions of common data structures used in traffic manager. ...
Definition: Carla.cpp:99
static auto make_map_values_const_iterator(It it)
Creates an iterator over const references to the values of a map.
Definition: Iterator.h:43
static auto make_map_keys_const_iterator(It it)
Creates an iterator over const references to the keys of a map.
Definition: Iterator.h:25