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annotate anagram/guisupport/action.h @ 15:f5acaf0c8a29

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Don't cast through "volatile int". Causes a gcc warning nowadays. XXX: should put something else back here to frighten the optimizer
author David A. Holland
date Tue, 31 May 2022 01:00:55 -0400
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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 * action.h
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7 */
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8
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9 #ifndef ACTION_H
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10 #define ACTION_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 AgAction {
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16 public:
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17
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18 class Kernel {
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19 private:
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20 int useCount;
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21 public:
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22 virtual ~Kernel() {}
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23 virtual void perform() const = 0;
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24
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25 Kernel() : useCount(0) {}
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26 void lock() { useCount++; }
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27 int unlock() { return --useCount <= 0; }
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28 };
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29
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30 protected:
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31 Kernel *kernel;
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32 static int running;
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33
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34 static AgStack<AgAction> startupStack;
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35
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36 public:
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37 AgAction() : kernel(0) {}
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38 AgAction(AgAction::Kernel *kernel_) : kernel(kernel_) {
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39 if (kernel) {
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40 kernel->lock();
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41 }
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42 }
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43 AgAction(const AgAction &a) : kernel(a.kernel) {
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44 if (kernel) {
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45 kernel->lock();
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46 }
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47 }
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48 AgAction &operator = (const AgAction &a) {
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49 if (kernel && kernel->unlock()) {
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50 delete kernel;
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51 }
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52 kernel = a.kernel;
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53 if (kernel) {
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54 kernel->lock();
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55 }
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56 return *this;
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57 }
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58 ~AgAction() {
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59 if (kernel && kernel->unlock()) {
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60 delete kernel;
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61 kernel = 0;
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62 }
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63 }
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64 int exists() { return kernel != 0; }
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65 void perform() const { if (kernel) kernel->perform(); }
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66 void operator () () const { if (kernel) kernel->perform(); }
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67 //void defer() const;
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68 void performDeferred() const;
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69 static void startup();
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70 int operator < (const AgAction &a) const { return this < &a; }
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71 };
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72
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73
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74 template<class T>
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75 class AgClassAction : public AgAction {
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76 private:
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77
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78 class Kernel : public AgAction::Kernel {
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79 private:
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80 T &object;
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81 void (T:: * memberFunction)();
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82
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83 public:
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84 Kernel(T &object_, void (T:: * memberFunction_)()) :
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85 object(object_) ,
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86 memberFunction(memberFunction_)
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87 {}
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88 void perform() const {(object.*memberFunction)();}
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89 };
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90
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91 public:
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92 AgClassAction(T &object_, void (T:: * memberFunction_)()) :
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93 AgAction(new AgClassAction<T>::Kernel(object_,memberFunction_))
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94 {}
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95 AgClassAction(const AgClassAction<T> &a) :
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96 AgAction(a)
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97 {}
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98 };
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99
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100 template <class T>
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101 AgAction actionObject(T *t, void (T:: * memberFunction)()) {
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102 return AgClassAction<T>(*t, memberFunction);
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103 }
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104
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105 void defer(void (*f)());
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106
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107 template <class T>
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108 void defer(T *t, void (T:: * memberFunction)()) {
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109 AgClassAction<T>(*t, memberFunction).performDeferred();
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110 }
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111
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112 class AgSimpleAction : public AgAction {
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113 private:
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114
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115 class Kernel : public AgAction::Kernel {
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116 void (* function)();
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117 public:
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118 Kernel(void (* function_)()) :
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119 function(function_)
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120 {}
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121 void perform() const {(*function)();}
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122 };
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123
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124 public:
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125 AgSimpleAction(void (* function_)()) :
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126 AgAction(new AgSimpleAction::Kernel(function_))
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127 {}
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128 AgSimpleAction(const AgSimpleAction &a) :
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129 AgAction(a)
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130 {}
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131 };
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132
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133 AgAction actionObject(void (* function)());
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134
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135
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136 ////////////////////////////////////////////////////////////
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137 //
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138 // interaction with GUI event loop
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139
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140 // this must be provided by the GUI - see e.g. vaclgui/actionwin.cpp
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141 // (not defined in action.cpp)
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142 void AgActionEnqueueInGui(AgAction::Kernel *kernel);
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143
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144 // and the GUI should hand the object back to this function.
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145 void AgActionDispatchFromGui(AgAction::Kernel *kernel);
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146
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147
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148 #endif /* ACTION_H */