Re: struct environment

[Daniel Jacobowitz <drow@mvista.com>]

On Tue, Sep 17, 2002 at 01:54:07PM -0400, Andrew Cagney wrote:
> >Well, sort of.  It won't be a DAG necessarily (I think that mutual
> >>>"using" statements are legal in C++; I remember a GCC bug involving
> >>>them was fixed not long ago), and it will be somewhat complicated
> >>>figuring out which ones to look up (namespace links are different than
> >>>block scope links).
> >
> >>
> >>Don't forget that GDB doesn't need to model the language.  Just the 
> >>namespace behavior at a given PC.  The effect of "using" would be to 
> >>just grow a nametab in someway.
> >
> >
> >This is legal C++:
> >
> >namespace D {}
> >
> >namespace C { 
> >  using namespace D;
> >  int x, y;
> >}
> >
> >namespace D {
> >  using namespace C;
> >  int x, z;
> >}
> >
> >If using just grew a nametab we'd get into a great deal of trouble.
> 
> Depends on how you grow it :-)  Something like (assuming a real language 
> :-):
> 	D:
> 	0: x, z
> 	1: x, y (from C)
> 	2: ...

How you intend to do this efficiently I don't know.  Remember that C
uses D in turn, and that things "using"'d into D will therefore be
visible in C.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer