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annotate anagram/support/agnotify.h @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
parents 13d2b8934445
children
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 1997-2002 Parsifal Software. All Rights Reserved.
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4 * See the file COPYING for license and usage terms.
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5 *
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6 * agnotify.h
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7 */
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8
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9 #ifndef AGNOTIFY_H
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10 #define AGNOTIFY_H
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11
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12 #include "agstack.h"
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13
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14
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15 class AgNotifierBase;
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16
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17 class AgNotificationActionBase {
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18 protected:
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19 AgStack<AgNotifierBase *> notifierStack;
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20 public:
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21 AgNotificationActionBase() {}
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22 virtual ~AgNotificationActionBase();
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23 virtual void perform() {}
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24 AgNotificationActionBase &attach(AgNotifierBase *notifier);
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25 void remove(AgNotifierBase *notifier);
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26 };
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27
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28 template <class T>
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29 class AgNotificationAction : public AgNotificationActionBase {
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30 protected:
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31 T *object;
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32 void (T::*memberFunction)();
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33 public:
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34 AgNotificationAction(T *x, void (T::*f)()): object(x), memberFunction(f) {}
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35 void perform() { (object->*memberFunction)(); }
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36 };
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37
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38 class AgNotifierBase {
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39 protected:
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40 AgStack<AgNotificationActionBase *> notifyStack;
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41 void notify();
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42
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43 public:
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44 AgNotifierBase() {}
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45 virtual ~AgNotifierBase();
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46 void attach(AgNotificationActionBase *action) {
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47 notifyStack.push(action);
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48 }
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49 void remove(AgNotificationActionBase *action);
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50 };
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51
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52 template <class T>
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53 class AgNotifier : public AgNotifierBase {
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54 protected:
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55 T contents;
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56
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57 public:
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58 AgNotifier(const T &d) : contents(d) {}
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59 AgNotifier(const AgNotifier<T> &d) : contents(d.contents) {}
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60 operator T &() { return contents; }
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61 //T &data() { return contents; }
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62 T *pointer() { return &contents; }
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63 virtual void initialize(const T &d) {
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64 contents = d;
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65 }
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66 virtual T &operator = (const T &d) {
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67 contents = d;
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68 notify();
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69 return contents;
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70 }
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71 };
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72
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73
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74 #endif /* AGNOTIFY_H */