question about anonymous union usage

[Jeffrey Holle <jeff.holle@xxxxxxxxxxx>]

I'm using g++ v3.4.1.

I'm considering using an anonymous union in the following fashion:

  class SomeClass
  {
    ....
  private:
    bool isPseudo_;
    union {
      LayoutVertex *layoutVertex_;
      PseudoVertex *pseudoVertex_;
    };
  }

Both LayoutVertex and PseudoVertex have the same methods.

Only in the constructors of SomeClass will I have to code in a way that 
differenciates between layoutVertex_ and psuedoVertex_.

My question is can I safely use layoutVertex_ elsewhere even if its 
initialized with a PsuedoVertex object?