23种计划模式 - 下令模式 - ToB企服应用市场:ToB评测及商务社交产业平台

#include
#include
#include
// 接收者：数控机床
class CNC_Machine {
public:
void start() {
std::cout << "数控机床启动，开始加工..." << std::endl;
}
void pause() {
std::cout << "数控机床暂停..." << std::endl;
}
void emergencyStop() {
std::cout << "紧急停止！机床复位中..." << std::endl;
}
};
// 抽象命令类
class Command {
public:
virtual ~Command() = default;
virtual void execute() = 0;
virtual void undo() = 0; // 支持撤销操作[4][7]
};
// 具体命令：启动命令
class StartCommand : public Command {
private:
CNC_Machine& receiver_;
public:
explicit StartCommand(CNC_Machine& machine) : receiver_(machine) {}
void execute() override {
receiver_.start();
}
void undo() override {
std::cout << "撤销启动：停止加工" << std::endl;
}
};
// 具体命令：急停命令
class EmergencyStopCommand : public Command {
private:
CNC_Machine& receiver_;
public:
explicit EmergencyStopCommand(CNC_Machine& machine) : receiver_(machine) {}
void execute() override {
receiver_.emergencyStop();
}
void undo() override {
std::cout << "撤销急停：恢复运行状态" << std::endl;
}
};
// 调用者：控制面板
class ControlPanel {
private:
std::stack> history_;
public:
void executeCommand(std::unique_ptr cmd) {
cmd->execute();
history_.push(std::move(cmd)); // 记录操作历史[4][7]
}
void undoLastCommand() {
if (!history_.empty()) {
history_.top()->undo();
history_.pop();
}
}
};
// 客户端使用
int main() {
CNC_Machine machine;
ControlPanel panel;
// 发送启动命令
panel.executeCommand(std::make_unique(machine));
// 发送急停命令
panel.executeCommand(std::make_unique(machine));
// 撤销上一次操作
panel.undoLastCommand(); // 输出：撤销急停：恢复运行状态
return 0;
}

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