Say I have several objects within a class, each of which needs constructing with a different value. I can write something like this:

class b
{
public:
  b(int num)
    {
    // 1 for a.b1, and 2 for a.b2
    }
};

class a
{
public:
  b b1;
  b b2;
  a() : b1(1), b2(2)
    {
    }
};

However, is it possible to do the same thing if those multiple objects are stored in an array?

My first attempt at it doesn't compile:

class a
{
public:
  b bb[2];
  a() : bb[0](1), bb[1](2)
    {
    }
};