1 | #include <cassert> |
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2 | #include <cstdlib> |
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3 | #include <iostream> |
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4 | #include <experimental/coroutine> |
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5 | #include <unistd.h> |
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6 | |
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7 | int random(int max) { |
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8 | return std::rand() % max; |
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9 | } |
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10 | |
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11 | struct Prod; |
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12 | struct Cons; |
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13 | |
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14 | struct Prod { |
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15 | struct local { |
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16 | Cons * c; |
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17 | int N, money, receipt; |
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18 | }; |
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19 | |
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20 | struct promise_type { |
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21 | local _l; |
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22 | |
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23 | Prod get_return_object() { |
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24 | return Prod(std::experimental::coroutine_handle<promise_type>::from_promise(*this)); |
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25 | } |
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26 | |
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27 | auto initial_suspend() { return std::experimental::suspend_never(); } |
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28 | auto final_suspend() { return std::experimental::suspend_always(); } |
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29 | |
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30 | void return_void() {} |
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31 | void unhandled_exception() {} |
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32 | }; |
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33 | |
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34 | struct data { |
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35 | promise_type * _promise = nullptr; |
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36 | bool await_ready() noexcept { return false; } |
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37 | void await_suspend(std::experimental::coroutine_handle<promise_type> _coroutine) noexcept { |
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38 | _promise = &_coroutine.promise(); |
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39 | } |
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40 | local & await_resume() noexcept { assert(_promise); return _promise->_l; } |
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41 | }; |
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42 | |
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43 | std::experimental::coroutine_handle<promise_type> _coroutine = nullptr; |
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44 | |
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45 | explicit Prod(std::experimental::coroutine_handle<promise_type> coroutine) |
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46 | : _coroutine(coroutine) |
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47 | {} |
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48 | |
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49 | ~Prod() { |
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50 | if(_coroutine) { _coroutine.destroy(); } |
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51 | } |
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52 | |
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53 | Prod() = default; |
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54 | Prod(Prod const &) = delete; |
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55 | Prod& operator=(Prod const &) = delete; |
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56 | |
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57 | Prod(Prod&& other) { |
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58 | std::swap(_coroutine, other._coroutine); |
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59 | } |
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60 | |
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61 | Prod& operator=(Prod&& other) { |
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62 | if(&other != this) { |
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63 | _coroutine = other._coroutine; |
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64 | other._coroutine = nullptr; |
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65 | } |
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66 | return *this; |
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67 | } |
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68 | |
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69 | static Prod main(); |
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70 | |
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71 | auto payment(int money) { |
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72 | _coroutine.promise()._l.money = money; |
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73 | struct ret { |
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74 | int _receipt; |
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75 | bool await_ready() { return false; } |
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76 | void await_suspend(std::experimental::coroutine_handle<>) {} |
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77 | int await_resume() { return _receipt; } |
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78 | }; |
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79 | return ret{ _coroutine.promise()._l.receipt }; |
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80 | } |
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81 | |
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82 | auto start(int N, Cons & c) { |
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83 | _coroutine.promise()._l.c = &c; |
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84 | _coroutine.promise()._l.N = N; |
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85 | _coroutine.promise()._l.receipt = 0; |
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86 | _coroutine.resume(); |
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87 | } |
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88 | }; |
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89 | |
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90 | struct Cons { |
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91 | struct local { |
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92 | Prod * p; |
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93 | int p1, p2, status; |
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94 | bool done; |
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95 | }; |
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96 | |
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97 | struct promise_type { |
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98 | local _l; |
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99 | |
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100 | Cons get_return_object() { |
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101 | return Cons(std::experimental::coroutine_handle<promise_type>::from_promise(*this)); |
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102 | } |
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103 | |
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104 | auto initial_suspend() { return std::experimental::suspend_never(); } |
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105 | auto final_suspend() { return std::experimental::suspend_always(); } |
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106 | |
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107 | void return_void() {} |
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108 | void unhandled_exception() {} |
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109 | }; |
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110 | |
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111 | struct data { |
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112 | Prod * _p; |
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113 | data(Prod & prod) : _p(&prod) {} |
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114 | promise_type * _promise = nullptr; |
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115 | bool await_ready() noexcept { return false; } |
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116 | void await_suspend(std::experimental::coroutine_handle<promise_type> _coroutine) noexcept { |
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117 | _promise = &_coroutine.promise(); |
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118 | } |
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119 | local & await_resume() noexcept { assert(_promise); _promise->_l.p = _p; return _promise->_l; } |
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120 | }; |
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121 | |
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122 | std::experimental::coroutine_handle<promise_type> _coroutine = nullptr; |
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123 | |
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124 | explicit Cons(std::experimental::coroutine_handle<promise_type> coroutine) |
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125 | : _coroutine(coroutine) |
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126 | {} |
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127 | |
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128 | ~Cons() { |
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129 | if(_coroutine) { _coroutine.destroy(); } |
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130 | } |
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131 | |
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132 | Cons() = default; |
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133 | Cons(Cons const &) = delete; |
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134 | Cons& operator=(Cons const &) = delete; |
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135 | |
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136 | Cons(Cons&& other) { |
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137 | std::swap(_coroutine, other._coroutine); |
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138 | } |
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139 | |
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140 | Cons& operator=(Cons&& other) { |
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141 | if(&other != this) { |
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142 | _coroutine = other._coroutine; |
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143 | other._coroutine = nullptr; |
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144 | } |
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145 | return *this; |
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146 | } |
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147 | |
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148 | static Cons main( Prod & prod ); |
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149 | |
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150 | auto deliver(int p1, int p2) { |
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151 | _coroutine.promise()._l.p1 = p1; |
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152 | _coroutine.promise()._l.p2 = p2; |
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153 | |
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154 | struct ret { |
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155 | int _status; |
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156 | bool await_ready() { return false; } |
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157 | void await_suspend(std::experimental::coroutine_handle<>) {} |
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158 | int await_resume() { return _status; } |
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159 | }; |
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160 | return ret{ _coroutine.promise()._l.status }; |
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161 | } |
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162 | |
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163 | auto stop() { |
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164 | _coroutine.promise()._l.done = true; |
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165 | struct ret { |
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166 | bool await_ready() { return false; } |
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167 | void await_suspend(std::experimental::coroutine_handle<>) {} |
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168 | void await_resume() {} |
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169 | }; |
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170 | return ret{}; |
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171 | } |
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172 | }; |
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173 | |
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174 | Prod Prod::main() { |
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175 | auto & p = co_await Prod::data(); |
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176 | for(int i = 0; i < p.N; i++) { |
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177 | int p1 = random(100), p2 = random(100); |
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178 | std::cout << p1 << " " << p2; |
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179 | int status = co_await p.c->deliver(p1, p2); |
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180 | std::cout << " $" << p.money << std::endl << status; |
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181 | p.receipt += 1; |
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182 | } |
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183 | co_await p.c->stop(); |
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184 | std::cout << "prod stops"; |
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185 | } |
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186 | |
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187 | Cons Cons::main( Prod & prod ) { |
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188 | auto & c = co_await Cons::data( prod ); |
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189 | int money = 1, receipt; |
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190 | for(;!c.done ;) { |
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191 | std::cout << c.p1 << " " << c.p2 << std::endl << " $" << money; |
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192 | c.status += 1; |
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193 | receipt = co_await c.p->payment( money ); |
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194 | std::cout << " #" << receipt; |
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195 | money += 1; |
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196 | } |
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197 | std::cout << "const stops"; |
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198 | } |
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199 | |
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200 | int main() { |
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201 | auto prod = Prod::main(); |
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202 | auto cons = Cons::main( prod ); |
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203 | srandom( getpid() ); |
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204 | prod.start(5, cons); |
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205 | } |
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