On Fri, 7 Mar 2025 at 16:07, Arthur O'Dwyer <arthur.j.odwyer_at_[hidden]>
wrote:

> On Fri, Mar 7, 2025 at 4:02 AM Jonathan Wakely via Std-Proposals <
> std-proposals_at_[hidden]> wrote:
>
>>
>> You can create a magic variable for that if you want to, something like:
>>
>> struct maxtimeout_t {
>> template<class D = std::chrono::system_clo k::duration>
>> operator D() const noexcept {
>> return D::max();
>> }
>> };
>> constinit maxtimeout_t maxtimeout{};
>>
>
> This is the first time I recall ever seeing an `operator D` with a
> defaulted template parameter.
> Under what circumstances does that default template argument get used?
>

I was thinking of something like:
template<typename Duration> void wait(Duration d);
but of course that would just deduce the maxtimeout_t type instead.
And it wouldn't help for:
template<typename Rep, typename Period>
void wait(std::chrono::duration<Rep, Period>);
So it's not useful.