consider the following classes:

 class bar;
 class foo
 {
   public:
  foo(bar* b) : m_b(b) {}
   private:
  bar* m_b;
 };

 class bar
 {
               public:
  bar() : m_f(this) {}
//      ^^^ is this legal
   private:
  const foo m_f;
 };

Is the use of 'this' legal to initialize the constant foo member.  If
not, how does one get a pointer to object being constructed within
the constructor initializer?
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