1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/** \file dynamic_set.h */ // -*-c++-*-
// Copyright (C) 2010 Daniel Burrows
//
// 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 2 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; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#ifndef DYNAMIC_SET_H
#define DYNAMIC_SET_H
#include <sigc++/connection.h>
#include <sigc++/slot.h>
#include <memory>
namespace aptitude
{
namespace util
{
template<typename T>
class enumerator;
/** \brief An abstract interface for an unordered collection of
* objects that reports changes via signals.
*/
template<typename T>
class dynamic_set : public sigc::trackable
{
public:
virtual ~dynamic_set();
/** \brief Get the number of elements in the set. */
virtual std::size_t size() = 0;
/** \brief Get an enumerator over the elements of the set.
*
* The elements are retrieved in an arbitrary order.
*
* The returned enumerator may hold a strong reference to the
* set object; do not store it in a structure that could form a
* reference cycle with the set.
*/
virtual std::shared_ptr<enumerator<T> > enumerate() = 0;
/** \brief Register a slot to be invoked after an object is
* inserted into this set.
*/
virtual sigc::connection connect_inserted(const sigc::slot<void, T> &slot) = 0;
/** \brief Register a slot to be invoked after an object is
* removed from this set.
*/
virtual sigc::connection connect_removed(const sigc::slot<void, T> &slot) = 0;
};
template<typename T>
dynamic_set<T>::~dynamic_set()
{
}
/** \brief An abstract interface for an unordered collection of
* objects that reports changes via signals and that can be
* modified.
*/
template<typename T>
class writable_dynamic_set : public dynamic_set<T>
{
public:
/** \brief Insert an element into this set if it is not present.
*
* If the element was not already in the set, the inserted
* signal is invoked.
*/
virtual void insert(const T &t) = 0;
/** \brief Remove an element from this set if it is present.
*
* If the element was in this set, the removed signal is
* invoked.
*/
virtual void remove(const T &t) = 0;
};
}
}
#endif // DYNAMIC_SET_H
|
