Re: %union with STL

[Hans Aberg]

On 24 May 2009, at 16:13, Luca wrote:

> > C++ dont allow unions containing c++ classes
> I think you're wrong. The size of a pointer is always known at  
> compile time,  pair<const string,int>* it;  is a pointer and not an  
> object. The size is 4 bytes using a 32 bit OS.

The problem is what the C++ standard really defines. I recall 'union's  
can only contains POD (plain old data), which is defined as types  
built from the C subset. The new C++ will extend this definition.

But you can use void* and cast to this type. The Bison type-system  
does not work with proper C++ casting involving function calls anyway.

  Hans