C++ Boost signal2信号/插槽知识点

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signals2基于Boost的另一个库signals，实现了线程安全的观察者模式。在signals2中，观察者模式被称为信号/插槽（signals and slots），它是一种函数回调机制，一个信号关联了多个插槽，当信号发出时，所有关联它的插槽都会被调用。

下面就通过小案列来实现signal的使用

#include <iostream>#include <boost\signals2.hpp>#include <boost\function.hpp>#include <boost\bind.hpp>using namespace std;class Button{private:typedef boost::signals2::signal<void(int,int)> signalDef;typedef boost::signals2::signal<void(int,int)>::slot_type slotType;private:signalDef mysignal;boost::signals2::connection mConnection;public:boost::signals2::connection connectFun(const slotType& type){mConnection = mysignal.connect(type);return mConnection;}void sendSignal(){mysignal(10,20);}};void fun1(int a, int b){cout << "add result :" << a + b << endl;}void fun2(int a, int b){cout << "sub result :" << a - b << endl;}void fun3(int a ,int b){cout << "multi result :" << a * b << endl;}void main(){Button button;boost::signals2::connection con1 = button.connectFun(fun1);boost::signals2::connection con2 = button.connectFun(fun2);boost::signals2::connection con3 = button.connectFun(fun3);//con3.disconnect();while(1){system("pause");button.sendSignal();}     cin.get();}

下面槽函数是类的成员函数的时候

#include <iostream>#include <boost\signals2.hpp>#include <boost\bind.hpp>#include <boost\function.hpp>using namespace std;using namespace boost;template <typename signature>class Signal{public://typedef 信号typedef boost::signals2::signal<signature> defSignal;    typedef typename defSignal::slot_type defSlot;public://连接槽函数boost::signals2::connection connectFun(const defSlot& slot);//重载伪函数void operator()(typename defSignal::template arg<0>::type a0,typename defSignal::template arg<1>::type a1);private:defSignal mSignal;};//接收信号后响应的函数class FunRecv1{public:void action(int a, int b){  cout << "add result" << a + b << endl;}};//接收信号后响应的函数class FunRecv2{public:void action(int a, int b){  cout << "multi result" << a * b << endl;}}; //实现template <typename signature>boost::signals2::connection  Signal<signature>::connectFun(const defSlot& slot){return mSignal.connect(slot);}template <typename signature>void Signal<signature>::operator()(typename defSignal::template arg<0>::type a0,typename defSignal::template arg<1>::type a1){mSignal(a0,a1);}void main(){    Signal<void(int,int)> mysignal;FunRecv1 fun1;FunRecv2 fun2;//boost::function<void(int,int)> myfun = boost::bind(&FunRecv1::action,&fun1,_1,_2);//信号连接槽函数boost::signals2::connection con1 = mysignal.connectFun(boost::bind(&FunRecv1::action,&fun1,100,200));boost::signals2::connection con2 = mysignal.connectFun(boost::bind(&FunRecv2::action,&fun2,11,22));mysignal(100,200);con2.disconnect();mysignal(100,200);    cin.get();}

到这就能明白signal信号机制的重要性观察者与被观察者的模式

参考博客：http://www.tuicool.com/articles/ZvYNze

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