Thanks for the link, based on it I removed some of the nullptr usages 
keeping only assignments.

François

On 26/06/2024 23:41, Jonathan Wakely wrote:
> On Wed, 26 Jun 2024 at 21:39, François Dumont <frs.dumont@gmail.com> wrote:
>> Hi
>>
>> Here is my proposal to add support for fancy allocator pointer.
>>
>> The only place where we still have C pointers is at the
>> iterator::pointer level but it's consistent with std::list
>> implementation and also logical considering that we do not get
>> value_type pointers from the allocator.
>>
>> I also wondered if it was ok to use nullptr in different places or if I
>> should rather do __node_ptr{}. But recent modifications are using
>> nullptr so I think it's fine.
> I haven't reviewed the patch yet, but this answers the nullptr question:
> https://en.cppreference.com/w/cpp/named_req/NullablePointer
> (aka Cpp17NullablePointer in the C++ standard).
>