repos/Callback_10/Callback_10.cpp

#include <iostream>
#include <string>
#include "Header.h" // the implementation is here


/*
 *  https://stackoverflow.com/questions/2298242/callback-functions-in-c
 */

using namespace std;

// a dummy enum for this example
enum EventEnum { EVENT1, EVENT2, EVENT3 };

/**************************************************************************************************************
 *
 */
class MyClassWithMethod {
public:

    unsigned int age = 12;
    enum { MALE, FEMALE } sex;

    void registerCB(Dispatcher<int, long, double>& dispatcher) {
        using namespace std::placeholders;
        dispatcher.addCB(std::bind(&MyClassWithMethod::listener, this, _1, _2, _3));
    }

#if 1
    void registerCB(Dispatcher<string, EventEnum>& dispatcher) {
        using namespace std::placeholders;
        dispatcher.addCB(std::bind(&MyClassWithMethod::listener2, this, _1, _2));
    }
#endif 

#if 0
    void registerCB(Dispatcher<int, long, double>& dispatcher) {
        using namespace std::placeholders;
        dispatcher.addCB(std::bind(&MyClassWithMethod::listener, this, _1, _2, _3));
    }
#endif

private:
    // any method with the right signature can be used:
    void listener(int i, long l, double d) {
        cout << "listener() for " << this << ", got: " <<
            i << ", " << l << ", " << d << endl;
    }

    void listener2(string str, EventEnum evt) {
        cout << "listener() for " << this << ", got: " <<
            str << ", " << evt << endl;
    }
};


/**************************************************************************************************************
 *
 */

// template <class T>
void myCb(string str, EventEnum evt) {
    cout << "myCb: " << str << " got event " << evt << endl;
}

int main(int argc, char* argv[])
{
    // 2 example dispatchers, any number of arguments and types can be used:
    Dispatcher<string, EventEnum> d1;// here any cb(string, EventEnum) can register
    Dispatcher<int, long, double> d2;// here any cb(int, long, double) can register
    uint8_t mainAge = 12; 
    // 
    // From the "most simple" lambda usage example ...
    // 
    auto cbid1 = d1.addCB([&](string str, EventEnum evt) {
        cout << "CB1:" << str << " got event " << evt << endl;
        });

    auto cbid2 = d1.addCB([=](string str, EventEnum evt) {
        cout << "CB2:" << str << " got event " << evt << endl;
        });

    auto cbid3 = d1.addCB(&myCb);

    // d1.broadcast("** Dispatching to 2 is **", EVENT1);
    // d1.broadcast("**       E a s y       **", EVENT2);

    // d1.delCB(cbid1); // remove the first callback
    // d1.broadcast("** Dispatching to 1 is **", EVENT1);
    // d1.broadcast("**       E a s y       **", EVENT2);

    // d1.delCB(cbid2); // remove the second callback
    // d1.broadcast("** No one will see this **", EVENT3);

    // ... to the "most complex" **live** instance (not copy) usage example:


    MyClassWithMethod instance1;
    MyClassWithMethod instance2;
    instance1.registerCB(d1);
    instance2.registerCB(d2);
    // instance1.registerCB(myCb);

    d1.broadcast("myEvent", EVENT3);

    d2.broadcast(65000, 12345678910, 3.14159265);
    d2.broadcast(56000, 1987654321, 14159265.3);


    return 0;
}