Callbacks in C++
parameterize method name
//----------------------------------------
// l i b r a r y c o d e
//----------------------------------------
template <class P1>
class Callback1Base
{
public:
virtual void operator()(P1) const = 0;
virtual Callback1Base<P1>* clone() const = 0;
};
//----------------------------------------
template <class P1, class Client>
class Callback1:
public Callback1Base<P1>
{
public:
typedef void (Client::*PMEMFUNC)(P1);
Callback1(Client& client_,PMEMFUNC pMemfunc_):
_client(client_),
_pMemfunc(pMemfunc_)
{}
/*virtual*/ void operator()(P1 parm_) const
{(_client.*_pMemfunc)(parm_);}
/*virtual*/ Callback1<P1,Client>* clone() const
{return new Callback1<P1,Client>(*this);}
private:
Client& _client;
PMEMFUNC _pMemfunc;
};
//----------------------------------------
class Button
{
public:
Button(Callback1Base<Button*>& callback_):
_pCallback(callback_.clone())
{}
~Button() {delete _pCallback;}
void push() {(*_pCallback)(this);}
private:
Callback1Base<Button*>* _pCallback;
};
//----------------------------------------
// c l i e n t c o d e
//----------------------------------------
#include <iostream.h>
class CdPlayer
{
public:
void playButtonPushed(Button*) {cout << "PLAY" << endl;}
void stopButtonPushed(Button*) {cout << "STOP" << endl;}
};
//----------------------------------------
main()
{
CdPlayer aCdPlayer;
Callback1<Button*,CdPlayer>
playCallback(aCdPlayer,&CdPlayer::playButtonPushed);
Callback1<Button*,CdPlayer>
stopCallback(aCdPlayer,&CdPlayer::stopButtonPushed);
Button playButton(playCallback);
Button stopButton(stopCallback);
playButton.push();
stopButton.push();
return 0;
}
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Callbacks in C++
Copyright © 1996-2000 Paul Jakubik
Created: 26 July 1996. Last update: 26 November 2000.
pauljakubik@yahoo.com