Use emplace_back() where possible.
[pulseview.git] / pv / view / viewitemiterator.hpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2014 Joel Holdsworth <joel@airwebreathe.org.uk>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #ifndef PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP
21 #define PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP
22
23 #include <algorithm>
24 #include <cassert>
25 #include <iterator>
26 #include <memory>
27 #include <stack>
28 #include <type_traits>
29 #include <vector>
30
31 #include <pv/session.hpp>
32
33 namespace pv {
34 namespace views {
35 namespace TraceView {
36
37 template<class Owner, class Item> class ViewItemIterator
38 {
39 public:
40         typedef typename Owner::item_list::const_iterator child_iterator;
41         typedef std::shared_ptr<Item> value_type;
42         typedef ptrdiff_t difference_type;
43         typedef value_type pointer;
44         typedef const value_type& reference;
45         typedef std::forward_iterator_tag iterator_category;
46
47 public:
48         ViewItemIterator(Owner *owner) :
49                 owner_stack_({owner}) {}
50
51         ViewItemIterator(Owner *owner, child_iterator iter) :
52                 owner_stack_({owner}) {
53                 assert(owner);
54                 if (iter != owner->child_items().end())
55                         iter_stack_.push(iter);
56         }
57
58         ViewItemIterator(const ViewItemIterator<Owner, Item> &o) :
59                 owner_stack_(o.owner_stack_),
60                 iter_stack_(o.iter_stack_) {}
61
62         reference operator*() const {
63                 return *iter_stack_.top();
64         }
65
66         reference operator->() const {
67                 return *this;
68         }
69
70         ViewItemIterator<Owner, Item>& operator++() {
71                 using std::dynamic_pointer_cast;
72                 using std::shared_ptr;
73
74                 assert(!owner_stack_.empty());
75                 assert(!iter_stack_.empty());
76
77                 shared_ptr<Owner> owner(dynamic_pointer_cast<Owner>(
78                         *iter_stack_.top()));
79                 if (owner && !owner->child_items().empty()) {
80                         owner_stack_.push(owner.get());
81                         iter_stack_.push(owner->child_items().begin());
82                 } else {
83                         while (!iter_stack_.empty() && (++iter_stack_.top()) ==
84                                 owner_stack_.top()->child_items().end()) {
85                                 owner_stack_.pop();
86                                 iter_stack_.pop();
87                         }
88                 }
89
90                 return *this;
91         }
92
93         ViewItemIterator<Owner, Item> operator++(int) {
94                 ViewItemIterator<Owner, Item> pre = *this;
95                 ++*this;
96                 return pre;
97         }
98
99         bool operator==(const ViewItemIterator &o) const {
100                 return (iter_stack_.empty() && o.iter_stack_.empty()) || (
101                         iter_stack_.size() == o.iter_stack_.size() &&
102                         owner_stack_.top() == o.owner_stack_.top() &&
103                         iter_stack_.top() == o.iter_stack_.top());
104         }
105
106         bool operator!=(const ViewItemIterator &o) const {
107                 return !((const ViewItemIterator&)*this == o);
108         }
109
110         void swap(ViewItemIterator<Owner, Item>& other) {
111                 swap(owner_stack_, other.owner_stack_);
112                 swap(iter_stack_, other.iter_stack_);
113         }
114
115 private:
116         std::stack<Owner*> owner_stack_;
117         std::stack<child_iterator> iter_stack_;
118 };
119
120 template<class Owner, class Item>
121 void swap(ViewItemIterator<Owner, Item>& a, ViewItemIterator<Owner, Item>& b)
122 {
123         a.swap(b);
124 }
125
126 } // namespace TraceView
127 } // namespace views
128 } // namespace pv
129
130 #endif // PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP