[PATCH] Avoid allocator operator== in _Safe_container

[François Dumont]

On 09/08/21 12:45 pm, Jonathan Wakely wrote:
> On Mon, 9 Aug 2021 at 11:34, Jonathan Wakely wrote:
>> On Mon, 9 Aug 2021 at 11:33, Jonathan Wakely wrote:
>>> On Mon, 9 Aug 2021 at 11:26, François Dumont via Libstdc++
>>> <libstdc++@gcc.gnu.org> wrote:
>>>> Some newly introduced tests in
>>>> 23_containers/unordered_map/cons/default.cc revealed that we are forcing
>>>> the allocator type to have a operator==.
>>> All allocators are required to have operator== so that should not be a
>>> problem. What is the error?
>> OK, I see it. I just forgot to define operator== and operator!= for
>> the custom allocator in that new test, and that should be added.
> Fixed like this instead. Tested x86_64-linux with -D_GLIBCXX_DEBUG.
> Pushed to trunk.

Ok, I thought my change was better because we have many allocator types 
in tests without operator ==/!= (see 
23_containers/*/cons/noexcept_default_construct.cc). But of course the 
tests are not making any use of it for the moment, no big deal.

So this patch is just an optimization, may I still commit it ? Unless 
you like the fact that Debug mode is checking that those operators are 
provided when allocator-aware move constructor is being used.