How do I call a member's constructor when declaring a structure?

[Richard.J]

you might define a default constructor for the struct full_set that passes default values to your key objects:

struct full_set
{
   full_set()
   : n(0), e(0), d(0)
   {}

	key n,e,d;//n, e, and d are instances of the key class.
};

or you can define a constructor that takes parameters and uses them to construct your key objects:

struct full_set
{
   full_set( int a, int b, int c)
   : n(a), e(b), d(c)
   {}

	key n,e,d;//n, e, and d are instances of the key class.
};

or a combination of both...