🚀 go-pugleaf

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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