Re: %union with STL

[Luca]

Hans Aberg ha scritto:
> 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
I successfully  compiled a union containing pair<const string,int>* it; 
using bison 2.4.1.
I think you can use pointers to C++ class inside a union without any 
trouble. Just try it.

Luca