I'm not arguing Turing completeness here. I'm arguing trivial one to one mapping. Syntax sugar. Compare:

  struct foo {
    int   bar;
    float baz;
  };
  int   get_bar(foo);
  float get_baz(foo);

Which would emulate this:

  class foo {
  public:
    int   get_bar();
    float get_baz();
  private:
    int   bar;
    float baz;
  };

If you're interested, I wrote more about that here: http://loup-vaillant.fr/articles/classes-as-syntactic-sugar