How to do "events"

From:
timor.super@gmail.com
Newsgroups:
comp.lang.c++
Date:
12 Apr 2007 06:12:13 -0700
Message-ID:
<1176383533.793551.174420@e65g2000hsc.googlegroups.com>
Hi group,

I would like to simulate something that can be quite similar to
"Events".
I would like that a member function of a class can be "setted" as an
Event and that this method can be called after something special.
Consider the following example :
I'm setting a function with a pointor function, then in a while-true
block, I ask for an input, if input is "abc", i'm firing an event
(that prints "abc").

#include <iostream>
#include <string>

using namespace std;

typedef void (*fPtrEvent)();

class Event
{
private:
    static fPtrEvent fEvent;
public:
    Event() {};
    static void Set(fPtrEvent f)
    {
        fEvent = f;
    }
    void WhileTrue()
    {
        while(1)
        {
            string s;
            cin >> s;
            if (s == "abc" && fEvent != 0)
                fEvent();
            if (s == "q")
                break;
        }
    }
};

fPtrEvent Event::fEvent = 0;

class Test
{
public:
    static void DoPrint()
    {
        cout << "print abc" << endl;
    }
};

int main (void)
{
    Event *c = new Event();
    c->Set(&Test::DoPrint);
    c->WhileTrue();
    delete c;
    return 0;
}

What I would like from you is :
- to tell me if it's a good way to achieve what I want.
- if there are better way to do that.
- tell me how I can avoid to use static methods (because that means
can only access to static attributes)
- everything you want :)

Thanks for your help,

S.

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