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annotate anagram/support/agsignal.h @ 13:43d8b194fb4e

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Remove unused variables.
author David A. Holland
date Tue, 31 May 2022 00:59:00 -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 1993-2002 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 * agsignal.h
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7 */
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8
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9 #ifndef AGSIGNAL_H
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10 #define AGSIGNAL_H
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11
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12 #include "agstack.h"
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13 #include "assert.h"
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14
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15 /*
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16 * The classes Broadcaster<Message> and Requester<Message> allow type-safe
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17 * run-time binding to class methods where the name of the class containing
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18 * the method being called is not known to the calling method.
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19 *
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20 * Any method m with the prototype
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21 * void f(const Message &);
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22 * belonging to an instance x of class X can by bound to a Broadcaster<Message>
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23 * instance b in an instance y of a class Y by the following call:
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24 * connect(&x, X::f, y.b);
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25 *
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26 * Any number of "listeners" may be attached to a given broadcaster.
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27 *
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28 * For each type of message that an object is to send, it must have a member
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29 * object either of type Broadcaster<Message> or Requester<Message>, where
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30 * Message is an arbitrary class.
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31 *
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32 * If an instance x of the class X has a member b of type Broadcaster<Message>
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33 * a handler function h(const Message &) belonging to an instance, y, of an
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34 * arbitrary class Y may be connected to the
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35 *
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36 * [...? the comment stopped here]
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37 */
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38
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39 template <class Signal>
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40 class Listener {
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41 public:
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42 Listener() {}
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43 Listener(const Listener<Signal> &) {}
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44 virtual ~Listener() {}
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45 virtual void handle(const Signal &) { assert(0); }
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46 virtual int operator == (const Listener<Signal> &p) const {
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47 return p == *this;
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48 }
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49 virtual int operator < (const Listener<Signal> &) const { return 0; }
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50 //virtual Listener<Signal> *copy() const {
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51 // assert(0);
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52 // return (Listener<Signal> *)this;
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53 //}
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54 virtual Listener<Signal> *copy() const { assert(0); return NULL; }
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55 };
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56
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57 template <class Signal>
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58 class Broadcaster {
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59 private:
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60 AgStack<Listener<Signal> *> listenerStack;
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61 protected:
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62 void broadcast(const Signal &) const;
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63 public:
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64 Broadcaster(int log = 3) : listenerStack(log) {}
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65 void add(const Listener<Signal> &);
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66 void remove(const Listener<Signal> &);
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67 };
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68
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69 template <class Host, class Signal>
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70 class ListenerFor : public Listener<Signal> {
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71 private:
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72 Host *host;
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73 void (Host::*handler)(const Signal &);
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74 public:
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75 ListenerFor(Host *t, void (Host::*h)(const Signal &))
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76 : host(t), handler(h) {}
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77 ListenerFor(const ListenerFor<Host, Signal> &x)
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78 : host(x.host), handler(x.handler) {}
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79 void handle(const Signal &s) { (host->*handler)(s); }
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80 int operator == (const Listener<Signal> &r) const {
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81 const ListenerFor<Host,Signal> &rf = (const ListenerFor<Host,Signal> &) r;
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82 return (host == rf.host && handler == rf.handler);
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83 }
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84 int operator < (const Listener<Signal> &r) const {
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85 const ListenerFor<Host,Signal> &rf = (const ListenerFor<Host,Signal> &) r;
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86 return host == rf.host ? &handler < &rf.handler : host < rf.host;
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87 }
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88 ListenerFor<Host,Signal> *copy() const {
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89 return new ListenerFor<Host,Signal>(host, handler);
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90 }
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91 };
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92
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93 template <class Signal>
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94 void Broadcaster<Signal>::add(const Listener<Signal> &s) {
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95 int n = listenerStack.size();
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96 int i;
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97 for (i = 0; i < n; i++) {
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98 if (s == *listenerStack[i]) {
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99 return;
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100 }
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101 }
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102 listenerStack.push(s.copy());
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103 }
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104
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105 template <class Signal>
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106 void Broadcaster<Signal>::remove(const Listener<Signal> &s) {
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107 int n = listenerStack.size();
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108 int i;
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109 for (i = 0; i < n; i++) {
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110 if (s == *listenerStack[i]) {
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111 break;
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112 }
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113 }
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114 if (i == n) {
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115 return;
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116 }
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117 delete listenerStack[i];
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118 while (++i < n) {
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119 listenerStack[i-1] = listenerStack[i];
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120 }
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121 listenerStack.pop();
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122 }
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123
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124 template <class Signal>
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125 void Broadcaster<Signal>::broadcast(const Signal &s) const {
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126 int n = listenerStack.size();
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127 int i;
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128 for (i = 0; i < n; i++) {
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129 listenerStack[i]->handle(s);
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130 }
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131 }
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132
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133 template <class Host, class Signal>
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134 void connect(Host *host, void (Host::*handler)(const Signal &),
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135 Broadcaster<Signal> &broadcaster) {
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136 broadcaster.add(ListenerFor<Host,Signal>(host, handler));
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137 }
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138
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139 template <class Host, class Signal>
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140 void disconnect(Host *host, void (Host::*handler)(const Signal &),
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141 Broadcaster<Signal> &broadcaster) {
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142 broadcaster.remove(ListenerFor<Host,Signal>(host, handler));
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143 }
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144
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145 template <class Signal>
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146 class Responder {
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147 public:
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148 virtual void handle(Signal &) = 0;
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149 virtual int operator == (const Responder<Signal> &p) const = 0;
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150 virtual int operator == (const Responder<Signal> *p) const {
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151 return *p == *this;
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152 }
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153 virtual Responder<Signal> *copy() const = 0;
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154 };
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155
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156 template <class Signal>
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157 class Requester {
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158 private:
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159 AgStack<Responder<Signal> *> responderStack;
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160 int level;
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161
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162 protected:
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163 void request(Signal &);
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164
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165 public:
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166 Requester() : responderStack(3), level(0) {}
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167 void add(const Responder<Signal> &r) {
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168 responderStack.push(r.copy());
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169 level++;
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170 }
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171 void add(Responder<Signal> *r) {
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172 responderStack.push(r);
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173 level++;
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174 }
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175 void remove(const Responder<Signal> &);
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176 Responder<Signal> *pop() { return responderStack.pop(); }
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177 };
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178
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179 template <class Host, class Signal>
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180 class ResponderFor : public Responder<Signal> {
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181 private:
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182 Host *host;
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183 void (Host::*handler)(Signal &);
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184
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185 public:
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186 ResponderFor(Host *t, void (Host::*h)(Signal &)) : host(t), handler(h) {}
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187 void handle(Signal &s) { (host->*handler)(s); }
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188 int operator == (const Responder<Signal> &r) const {
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189 const ResponderFor<Host,Signal> &rf =
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190 (const ResponderFor<Host,Signal> &) r;
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191 return (host == rf.host && handler == rf.handler);
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192 }
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193 Responder<Signal> *copy() const {
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194 return new ResponderFor<Host,Signal>(host, handler);
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195 }
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196 };
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197
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198 template <class Signal>
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199 void Requester<Signal>::remove(const Responder<Signal> &s) {
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200 int n = responderStack.size();
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201 int i;
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202 for (i = 0; i < n; i++) {
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203 if (s == responderStack[i]) {
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204 break;
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205 }
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206 }
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207 if (i == n) {
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208 return;
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209 }
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210 delete responderStack[i];
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211 if (level >= i) {
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212 level--;
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213 }
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214 while (++i < n) {
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215 responderStack[i-1] = responderStack[i];
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216 }
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217 responderStack.pop();
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218 }
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219
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220 template <class Signal>
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221 void Requester<Signal>::request(Signal &s) {
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222 assert(level > 0);
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223 level--;
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224 responderStack[level]->handle(s);
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225 level++;
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226 }
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227
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228 template <class Host, class Signal>
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229 void connect(Host *host, void (Host::*handler)(Signal &),
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230 Requester<Signal> &requester) {
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231 requester.add(ResponderFor<Host,Signal>(host, handler));
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232 }
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233
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234 template <class Host, class Signal>
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235 void disconnect(Host *host, void (Host::*handler)(Signal &),
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236 Requester<Signal> &requester) {
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237 requester.add(ResponderFor<Host,Signal>(host, handler));
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238 }
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239
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240 template <class Signal>
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241 void reroute(Requester<Signal> &from, Requester<Signal> &to) {
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242 to.add(from.pop());
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243 }
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244
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245
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246 #endif /* AGSIGNAL_H */