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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/** \file dynamic_set_transform.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_TRANSFORM_H
#define DYNAMIC_SET_TRANSFORM_H
#include "dynamic_set.h"
#include "enumerator_transform.h"
#include <boost/function.hpp>
#include <boost/make_shared.hpp>
#include <boost/shared_ptr.hpp>
#include <sigc++/signal.h>
#include <sigc++/slot.h>
namespace aptitude
{
namespace util
{
/** \brief A wrapper that passes each element in a dynamic set
* through a function before passing it to client code.
*
* \tparam From The type of the values stored in the
* underlying dynamic_set.
* \tparam To The type of value produced by the transform.
*/
template<typename From, typename To>
class dynamic_set_transform : public dynamic_set<To>
{
boost::shared_ptr<dynamic_set<From> > wrapped_set;
boost::function<To (From)> f;
sigc::signal<void, To> signal_inserted;
sigc::signal<void, To> signal_removed;
void handle_inserted(const From &from);
void handle_removed(const From &from);
public:
/** \warning Should only be used by create(). */
dynamic_set_transform(const boost::shared_ptr<dynamic_set<From> > &_wrapped_set,
const boost::function<To (From)> &_f);
static boost::shared_ptr<dynamic_set_transform>
create(const boost::shared_ptr<dynamic_set<From> > &wrapped_set,
const boost::function<To (From)> &f);
std::size_t size();
boost::shared_ptr<enumerator<To> > enumerate();
sigc::connection connect_inserted(const sigc::slot<void, To> &slot);
sigc::connection connect_removed(const sigc::slot<void, To> &slot);
};
template<typename From, typename To>
dynamic_set_transform<From, To>::dynamic_set_transform(const boost::shared_ptr<dynamic_set<From> > &_wrapped_set,
const boost::function<To (From)> &_f)
: wrapped_set(_wrapped_set),
f(_f)
{
wrapped_set->connect_inserted(sigc::mem_fun(*this, &dynamic_set_transform::handle_inserted));
wrapped_set->connect_removed(sigc::mem_fun(*this, &dynamic_set_transform::handle_removed));
}
template<typename From, typename To>
boost::shared_ptr<dynamic_set_transform<From, To> >
dynamic_set_transform<From, To>::create(const boost::shared_ptr<dynamic_set<From> > &wrapped_set,
const boost::function<To (From)> &f)
{
return boost::make_shared<dynamic_set_transform<From, To> >(wrapped_set, f);
}
template<typename From, typename To>
std::size_t dynamic_set_transform<From, To>::size()
{
return wrapped_set->size();
}
template<typename From, typename To>
boost::shared_ptr<enumerator<To> > dynamic_set_transform<From, To>::enumerate()
{
return enumerator_transform<From, To>::create(wrapped_set->enumerate(), f);
}
template<typename From, typename To>
void dynamic_set_transform<From, To>::handle_inserted(const From &from)
{
signal_inserted(f(from));
}
template<typename From, typename To>
void dynamic_set_transform<From, To>::handle_removed(const From &from)
{
signal_removed(f(from));
}
template<typename From, typename To>
sigc::connection dynamic_set_transform<From, To>::connect_inserted(const sigc::slot<void, To> &slot)
{
return signal_inserted.connect(slot);
}
template<typename From, typename To>
sigc::connection dynamic_set_transform<From, To>::connect_removed(const sigc::slot<void, To> &slot)
{
return signal_removed.connect(slot);
}
}
}
#endif // DYNAMIC_SET_TRANSFORM_H
|
