Re: Variable objects and STL containers

[Vladimir Prus <ghost@cs.msu.su>]

Nick Roberts wrote:

>  > > 2) _M_impl, _M_start are gcc internals and I guess they could change (like
>  > >    CLI!)  Is it meaningful to ask on the gcc list for a formal interface
>  > >    to these details?
>  > 
>  > Technically, there is formal interface, called iterators, provided by the
>  > C++ standard. I don't have the slightest confidence in gdb not falling over
>  > if you try to use them, though.
> 
> Are iterators available to GDB, or just the executable? I only seem able to 
> access those methods which are used by my program, e.g.,
> 
> (gdb) p v.size ()
> $3 = 3
> 
> but
> 
> (gdb) p v.rbegin ()
> Cannot evaluate function -- may be inlined

Well, that what I mean by 'falling over', in part ;-) I would not
be suprised if attempt to increment an iterator, using the overloaded
operator++, also will fail.

>  > We discussed using Python scripting for that; in fact, I have a patch locally
>  > that will make
>  > 
>  >         -var-evaluate-expression V
>  > 
>  > for a vector print something like:
>  >
>  >         [1,2,3]
> 
> Does this work for programs compiled by any compiler, or just gcc?

For each different STL implementation, you'd need different Python code
to render vector.

- Volodya