1 | #include <boost/statechart/state_machine.hpp>
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2 | #include <boost/statechart/event.hpp>
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3 | #include <boost/statechart/simple_state.hpp>
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4 | #include <boost/statechart/custom_reaction.hpp>
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5 |
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6 | #include <iostream>
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7 |
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8 | namespace bs = boost::statechart;
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9 |
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10 | using namespace std;
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11 |
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12 | // The main event, should be handles by a sub-state and the main state
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13 | struct update_event;
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14 | // An event triggering the sub-state to switch
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15 | struct toggle_event;
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16 | // A dummy event
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17 | struct other_event;
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18 |
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19 | // Sub-states in 2 orthogonal regions
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20 | struct state_1A;
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21 | struct state_1B;
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22 | struct state_2A;
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23 | struct state_2B;
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24 |
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25 | // Main state
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26 | struct parent_state;
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27 |
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28 | // State machine consisting of the main state
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29 | struct machine : bs::state_machine<machine, parent_state>
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30 | {
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31 | };
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32 |
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33 | typedef
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34 | boost::mpl::list
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35 | < state_1A
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36 | , state_2A
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37 | > inner_states_t;
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38 |
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39 | // The main state has 2 orthogonal sub-states
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40 | struct parent_state : bs::simple_state<parent_state, machine, inner_states_t>
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41 | {
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42 | typedef boost::mpl::list
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43 | < bs::custom_reaction <update_event>
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44 | >
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45 | reactions;
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46 |
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47 | bs::result react(const update_event&)
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48 | {
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49 | cout << __FUNCTION__ << endl;
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50 |
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51 | return discard_event();
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52 | }
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53 | };
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54 |
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55 | struct update_event : bs::event<update_event>
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56 | {
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57 | };
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58 |
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59 | struct other_event : bs::event<other_event>
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60 | {
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61 | };
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62 |
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63 | struct toggle_event : bs::event<toggle_event>
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64 | {
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65 | };
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66 |
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67 | struct state_1A : bs::simple_state<state_1A, parent_state::orthogonal<0>>
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68 | {
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69 | typedef boost::mpl::list
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70 | < bs::custom_reaction <toggle_event>
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71 | , bs::custom_reaction <update_event>
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72 | >
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73 | reactions;
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74 |
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75 | state_1A()
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76 | {
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77 | cout << __FUNCTION__ << endl;
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78 | }
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79 |
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80 | bs::result react(const toggle_event&)
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81 | {
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82 | cout << __FUNCTION__ << endl;
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83 |
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84 | return transit<state_1B>();
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85 | }
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86 |
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87 | bs::result react(const update_event&)
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88 | {
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89 | cout << __FUNCTION__ << endl;
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90 |
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91 | return forward_event();
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92 | }
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93 | };
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94 |
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95 | struct state_1B : bs::simple_state<state_1B, parent_state::orthogonal<0>>
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96 | {
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97 | typedef boost::mpl::list
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98 | < bs::custom_reaction <toggle_event>
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99 | >
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100 | reactions;
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101 |
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102 | state_1B()
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103 | {
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104 | cout << __FUNCTION__ << endl;
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105 | }
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106 |
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107 | bs::result react(const toggle_event&)
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108 | {
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109 | cout << __FUNCTION__ << endl;
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110 |
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111 | return transit<state_1A>();
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112 | }
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113 | };
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114 |
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115 | struct state_2A : bs::simple_state<state_2A, parent_state::orthogonal<1>>
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116 | {
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117 | typedef boost::mpl::list
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118 | < bs::custom_reaction <other_event>
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119 | >
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120 | reactions;
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121 |
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122 | state_2A()
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123 | {
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124 | cout << __FUNCTION__ << endl;
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125 | }
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126 |
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127 | bs::result react(const other_event&)
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128 | {
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129 | cout << __FUNCTION__ << endl;
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130 |
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131 | return discard_event();
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132 | }
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133 | };
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134 |
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135 | struct state_2B : bs::simple_state<state_2B, parent_state::orthogonal<1>>
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136 | {
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137 | typedef boost::mpl::list
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138 | < bs::custom_reaction <other_event>
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139 | >
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140 | reactions;
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141 |
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142 | state_2B()
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143 | {
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144 | cout << __FUNCTION__ << endl;
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145 | }
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146 |
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147 | bs::result react(const other_event&)
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148 | {
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149 | cout << __FUNCTION__ << endl;
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150 |
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151 | return discard_event();
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152 | }
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153 | };
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154 |
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155 | int main(int argc, char* argv[])
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156 | {
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157 | machine m;
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158 |
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159 | cout << "0. Initiating state machine:" << endl;
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160 | m.initiate();
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161 |
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162 | cout << endl << "1. Processing 'other_event':" << endl;
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163 | m.process_event(other_event ());
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164 |
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165 | cout << endl << "2. Processing 'update_event':" << endl;
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166 | m.process_event(update_event());
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167 |
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168 | cout << endl << "3. Processing 'toggle_event':" << endl;
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169 | m.process_event(toggle_event());
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170 |
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171 | cout << endl << "4. Processing 'update_event':" << endl;
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172 | m.process_event(update_event());
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173 |
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174 | cout << endl << "5. Processing 'toggle_event':" << endl;
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175 | m.process_event(toggle_event());
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176 |
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177 | cout << endl << "6. Processing 'update_event':" << endl;
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178 | m.process_event(update_event());
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179 |
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180 | return 0;
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181 | }
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182 |
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183 | //////////////////////////////////////////////////////////////////////////
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184 | // Program output after building with VC 9 and Boost 1.37.0
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185 | //
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186 | // Note the different event handling in step 6. as compared to step 2.
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187 | // although the machine should be back in the same state.
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188 | //////////////////////////////////////////////////////////////////////////
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189 |
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190 | /*
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191 |
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192 | 0. Initiating state machine:
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193 | state_1A::state_1A
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194 | state_2A::state_2A
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195 |
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196 | 1. Processing 'other_event':
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197 | state_2A::react
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198 |
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199 | 2. Processing 'update_event':
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200 | state_1A::react
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201 | parent_state::react
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202 |
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203 | 3. Processing 'toggle_event':
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204 | state_1A::react
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205 | state_1B::state_1B
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206 |
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207 | 4. Processing 'update_event':
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208 | parent_state::react
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209 |
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210 | 5. Processing 'toggle_event':
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211 | state_1B::react
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212 | state_1A::state_1A
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213 |
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214 | 6. Processing 'update_event':
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215 | parent_state::react
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216 |
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217 | */
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