Question

I think the code is self-explanatory:

MyClass* pointer = NULL;
changePointer( pointer );
if (pointer == NULL) 
{
   // it's entering here :(
}



    void changePointer( MyClass* p)
    {
        MyClass* temp = NULL;
        for (int i = 0; i < myContainer.size(); ++i) 
        {
            p = &(myContainer[i]);

            if (p == NULL) 
            {
                 // it's not entering here :)
            }
        }
    }

Answer 1

The pointer is being passed by value, not by reference, so the original variable cannot be changed. You need to change the function signature to:

void changePointer(MyClass** p)

…and pass a pointer to the pointer:

changePointer(&pointer);

You’ll need to make some corresponding changes in the body of the function, too.