Question

I wonder whether memory for array member of a class be allocated in c++.
In my class, I defined array member like this:

class A
{
  public:
    B* B_array[1000];
}

and, in the constructor, I want to use it:

A::A()
{
  for(int i = 0; i < 1000; i++)
  {
     B_array[i] = new B;//can i use B_array[0...999]???
  }
}

Answer 1

B* B_array[1000];

What you have is an array of 1000 pointers to the type B.

  for(int i = 0; i < 1000; i++)
  {
       B_array[i] = new B;//can i use B_array[0...999]???
  }

Allocates memory to each pointer in the array, after this statement each pointer points to a memory on heap.

So yes you can use each of them, once this code is executed.