衡阳网站排名优化费用,专业制作广告,网站备案多少天,企业做网站做什么科目信号与槽通常被用于对象间的通信、事件驱动等场景#xff0c;相比于回调函数的优势是动态连接、支持多对多、参数类型检查更安全、更加松耦合等。 这里提供一个C实现的简易仿信号与槽的框架。注#xff1a;QT中信号与槽是基于较复杂的元对象系统#xff0c;而这里只是以基本… 信号与槽通常被用于对象间的通信、事件驱动等场景相比于回调函数的优势是动态连接、支持多对多、参数类型检查更安全、更加松耦合等。 这里提供一个C实现的简易仿信号与槽的框架。注QT中信号与槽是基于较复杂的元对象系统而这里只是以基本功能为导向提供简易实现。 信号和槽函数的创建、连接、触发、断连。 code
#include iostream
#include functional
#include vector
#include map#define CONNECT(signal, slot) signal.connect(slot, #slot)
#define DISCONNECT(signal, slot) signal.disconnect(#slot)template typename... Args
class GenericSignal
{
public:using SlotType std::functionvoid(Args...);void connect(SlotType slot, const std::string slotName){slots[slotName] std::move(slot);}void disconnect(const std::string slotName){auto it slots.find(slotName);if (it ! slots.end()){slots.erase(it);}}template typename... SignalArgsvoid emitSignal(SignalArgs ...args) const{for (const auto slotPair : slots){slotPair.second(std::forwardSignalArgs(args)...);}}private:std::mapstd::string, SlotType slots;
};void slotFunction1(int arg1, const std::string arg2)
{std::cout Slot 1 called with arg1 and arg2 std::endl;
}void slotFunction2(int arg1, const std::string arg2)
{std::cout Slot 2 called with arg1 and arg2 std::endl;
}int main()
{GenericSignalint, const std::string signal;CONNECT(signal, slotFunction1);CONNECT(signal, slotFunction2);std::cout Emitting signal... std::endl;signal.emitSignal(1, Hello);DISCONNECT(signal, slotFunction1);std::cout \nEmitting signal after disconnecting slotFunction1... std::endl;signal.emitSignal(2, Hello);return 0;
}result
Emitting signal...
Slot 1 called with 1 and Hello
Slot 2 called with 1 and HelloEmitting signal after disconnecting slotFunction1...
Slot 2 called with 2 and Hello
