blob: 36c1d3de0ca73bdcb4b97fb2b13966e848b677c0 (
plain)
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
|
/* lazy.vala
*
* Copyright (C) 2011 Maciej Piechotka
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Maciej Piechotka <uzytkownik2@gmail.com>
*/
namespace Gee {
public delegate G LazyFunc<G> ();
}
/**
* Represents a lazy value. I.e. value that is computed on demand.
*/
public class Gee.Lazy<G> {
public Lazy (owned LazyFunc<G> func) {
_func = (owned)func;
}
public Lazy.from_value (G item) {
_value = item;
}
public void eval () {
if (_func != null) {
_value = _func ();
_func = null;
}
}
public new G get () {
eval ();
return _value;
}
public new G value {
get {
eval ();
return _value;
}
}
private LazyFunc<G>? _func;
private G? _value;
}
|
