Mercurial > ~dholland > hg > ag > index.cgi

comparison anagram/support/agnotify.h @ 0:13d2b8934445

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:13d2b8934445
1 /*
2 * AnaGram, A System for Syntax Directed Programming
3 * Copyright 1997-2002 Parsifal Software. All Rights Reserved.
4 * See the file COPYING for license and usage terms.
5 *
6 * agnotify.h
7 */
8
9 #ifndef AGNOTIFY_H
10 #define AGNOTIFY_H
11
12 #include "agstack.h"
13
14
15 class AgNotifierBase;
16
17 class AgNotificationActionBase {
18 protected:
19 AgStack<AgNotifierBase *> notifierStack;
20 public:
21 AgNotificationActionBase() {}
22 virtual ~AgNotificationActionBase();
23 virtual void perform() {}
24 AgNotificationActionBase &attach(AgNotifierBase *notifier);
25 void remove(AgNotifierBase *notifier);
26 };
27
28 template <class T>
29 class AgNotificationAction : public AgNotificationActionBase {
30 protected:
31 T *object;
32 void (T::*memberFunction)();
33 public:
34 AgNotificationAction(T *x, void (T::*f)()): object(x), memberFunction(f) {}
35 void perform() { (object->*memberFunction)(); }
36 };
37
38 class AgNotifierBase {
39 protected:
40 AgStack<AgNotificationActionBase *> notifyStack;
41 void notify();
42
43 public:
44 AgNotifierBase() {}
45 virtual ~AgNotifierBase();
46 void attach(AgNotificationActionBase *action) {
47 notifyStack.push(action);
48 }
49 void remove(AgNotificationActionBase *action);
50 };
51
52 template <class T>
53 class AgNotifier : public AgNotifierBase {
54 protected:
55 T contents;
56
57 public:
58 AgNotifier(const T &d) : contents(d) {}
59 AgNotifier(const AgNotifier<T> &d) : contents(d.contents) {}
60 operator T &() { return contents; }
61 //T &data() { return contents; }
62 T *pointer() { return &contents; }
63 virtual void initialize(const T &d) {
64 contents = d;
65 }
66 virtual T &operator = (const T &d) {
67 contents = d;
68 notify();
69 return contents;
70 }
71 };
72
73
74 #endif /* AGNOTIFY_H */