mem_fun and bind1st problem

Question

I\'ve following class:

class A {
public:
// ctr and etc ...
A*   clone(B* container);
};

Now, I\'ve a vector availableObjs

Answer 1

You need to use bind2nd instead of bind1st:

transform(availableObjs.begin(), availableObjs.end(), back_inserter(clonedObjs),
    bind2nd(mem_fun(&A::clone), container)); // container is of type B*

The functor created by mem_fun(&A::clone) expects an A* as its first parameter. This is the normally implicitly specified instance on which the method is called. The first "real" parameter of A::clone is the second parameter of mem_fun(&A::clone) and therefore needs to be bound with bind2nd.

Answer 2

If you use Boost.Bind it might look like this:

std::transform(
               availableObjs.begin(), availableObjs.end(), 
               back_inserter(clonedObjs),
               boost::bind<A*>(boost::mem_fn(&A::clone), _1, container) );