How to avoid successive deallocations/allocations in C++?

Question

Consider the following code:

class A
{
    B* b; // an A object owns a B object

    A() : b(NULL) { } // we don\'t know what b will be when constructing A

             


        

Answer 1

Erm, is there some reason you can't do this?

A() : b(new B()) { }

void calledVeryOften(…) 
{
    b->setValues(param1, param2, param3, param4); 
}

(or set them individually, since you don't have access to the B class - those values do have mutator-methods, right?)