c++ Function member pointer

Question

I have read several posts about this, but can\'t seem to find exactly what i am looking for with example code if anyone could give me some help i would highly appreciate it.

Answer 1

For member function you need a bind. A member function is a "normal function" that has an implicit parameter of its class. So you need a binder. If you use c++11 you can use std::bind and std::function or you can use boost::bind and boost::function for non c++11 code.

typedef std::function< void ( Pack* ) > MyFunction;
void addEvent( MyFunction f );
void triggerEvents( Pack* );
std::list< MyFunction > eventList;

void DNetwork::addEvent( MyFunction f )
{
    eventList.push_back( f );
}

void DNetwork::triggerEvents( Pack *pack )
{
    for ( auto it = eventList.begin(); it != eventList.end(); it++ )
    {
        (*it)(pack);
    } 
}

Now if I have the class A with the method doA( Pack* ) I will write:

A a;
Pack pack;
DNetwork d;
d.addEvent( std::bind( &A::doA, &a, &pack ) );

Or even better you can use Boost.Signal or you can use the Publisher/Subcriber Pattern

Edit As @DavidRodríguez-dribeas suggest: The bind should not take the &pack argument, as the argument to the member function is provided at the place of call in triggerEvents. The correct way is:

A a;
Pack pack;
DNetwork d;
d.addEvent( std::bind( &A::doA, &a, std::placeholders::_1 ) );
d.triggerEvents( &pack );