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annotate anagram/guisupport/action.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
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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 */