A (crude) C++ example of using a class within a class.

classClass.cpp

#include <iostream>
#include <string>
using namespace std;

class alpha
{
  public:
  static string alphaFunc()
  {
    return "Greetings from the alpha class.\n";
  }
};

class beta
{
  public:
  void alphaBeta()
  {
    cout << alpha::alphaFunc();
  }
};

int main()
{
  beta b;

  b.alphaBeta();

  return 0;
}