Smart pointer pretty printers

[Juraj Oršulić]

On Fri, Feb 24, 2017 at 5:36 PM, Jonathan Wakely <jwakely@redhat.com> wrote:
> For a patch this size we do, so I'm not going to look at your patch.
> It will probably be simpler to just do it myself, and not worry about
> paperwork.
>
> If you want to contribue in future then please do complete the
> necessary paperwork anyway:
> https://gcc.gnu.org/onlinedocs/libstdc++/manual/appendix_contributing.html#contrib.list

Hi Jonathan,

I have completed the assignment.

I am resubmitting the patch from the last time, this time as an
attachment (since the previous was broken by newlines). As before,
there are two versions of the patch: the one that I obtained by editing
printers.py on Ubuntu 16.04, which ships with gcc 5.4.0; and the
other, for the current printers.py from the gcc repo (I assume it's gcc
6?), which needs a slightly different patch because the unique_ptr
printer has significantly changed.

I have been using the gcc 5 patch without problems.  I have not tested
the gcc 6 patch, but since it is very similar, I don't expect any
problems.

Let me know if you want me to expand this for other iterators.

Regards,
Juraj
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