[PATCH][_Hashtable] Fix insertion of range of type convertible to value_type PR 56112

[Jonathan Wakely]

On Mon, 21 Feb 2022 at 18:00, François Dumont via Libstdc++ <
libstdc++@gcc.gnu.org> wrote:

> Gentle reminder, it is important to have this for gcc 12.
>

Well, it's been broken since 4.8, so another year wouldn't be the end of
the world ;-)

I did start reviewing it, but I was trying to find a simpler way to solve
it than adding all those overloads. I'll take another look tomorrow and
either approve your patch or suggest something else.



>
> On 15/02/22 10:05, François Dumont wrote:
> > We have a regression regarding management of types convertible to
> > value_type. It is an occurrence of PR 56112 but for the insert method.
> >
> >     libstdc++: [_Hashtable] Insert range of types convertible to
> > value_type PR 56112
> >
> >     Fix insertion of range of types convertible to value_type.
> >
> >     libstdc++-v3/ChangeLog:
> >
> >             PR libstdc++/56112
> >             * include/bits/hashtable.h
> >             (_Hashtable<>::_M_insert_unique_aux): New.
> >             (_Hashtable<>::_S_to_value): New.
> >             (_Hashtable<>::_M_insert(_Arg&&, const _NodeGenerator&,
> > true_type)): Use latters.
> >             * testsuite/23_containers/unordered_map/cons/56112.cc: Use
> > dg-do compile.
> >             * testsuite/23_containers/unordered_set/cons/56112.cc: New
> > test.
> >
> > Tested under Linux x86_64.
> >
> > Ok to commit ?
> >
> > François
>
>
>