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Quellcode

#include <iostream>

unsigned int maxTypeID = 0;

template < typename T >
unsigned int type() {
    static unsigned int id = ++maxTypeID;
    return id;
}
template < typename T >
unsigned int type( T t ) {
    return type<decltype( t )>();
}

void main() {
    int a = 1;
    int b = 2;
    float c = 3;

    std::cout << type(a) << std::endl;
    std::cout << type(b) << std::endl;
    std::cout << type(c) << std::endl;

    if(type(5) == type<int>())
        std::cout << "ok" << std::endl;
}

Quellcode

#include <iostream>
#include <vector>

unsigned int maxTypeID = 0;

template < typename T >
unsigned int type() {
    static unsigned int id = ++maxTypeID;
    return id;
}
template < typename T >
unsigned int type( T t ) {
    return type<decltype( t )>();
}

class IEvent {
public:
    IEvent() {}
    virtual ~IEvent() {}
    virtual unsigned int Type() = 0;
};

template < typename T >
class EventType : public IEvent {
public:
    EventType() {}
    virtual ~EventType() {}
    unsigned int Type() {
        return type<T>();
    }
};

class A : public EventType<A> {
public:
    A() {}
    ~A() {}
};

class B : public EventType<B> {
public:
    B() {}
    ~B() {}
};

void main() {
    std::vector<IEvent*> events;

    A e1;
    B e2;
    B e3;
    A e4;
    A e5;
    events.push_back( &e1 );
    events.push_back( &e2 );
    events.push_back( &e3 );
    events.push_back( &e4 );
    events.push_back( &e5 );


    for(IEvent* e : events)
        std::cout << "Event Type: " << e->Type() << std::endl;

}

Quellcode

    for (IEvent* e : events) {
        if (e->Type() == type< A >()) {
            A* a = static_cast< A* >( e );
            a->PrintA();
        } else if (e->Type() == type< B >()) {
            B* b = static_cast< B* >( e );
            b->PrintB();
        }
    }