简单的callback

#include "stdafx.h"
#include <set>
#include "time.h"
template <class T>
class CCallback
{
public:
typedef void (T::*fn)( int anArg );


CCallback(T& trg, fn op)
: m_rTarget(trg)
, m_Operation(op)
{
}


void Execute( int in )
{
(m_rTarget.*m_Operation)( in );
}


private:


CCallback();
CCallback( const CCallback& );


T& m_rTarget;
fn m_Operation;


};


class A
{
public:
virtual void Fn( int i )
{
printf("-----%d\r\n",i);
int d = 0;
}
};




int main( int /*argc*/, char * /*argv*/ )
{
A a;
CCallback<A> cbk( a, &A::Fn );
cbk.Execute( 3 );
int d = 0;
}