template <std::ranges::forward_range Rng>
requires(std::ranges::borrowed_range<Rng>)
generator<std::ranges::range_value_t<Rng>> circular_view(Rng&& r) {


const auto it = std::ranges::begin(r);
const auto sent = std::ranges::end(r);
while (true) {
for (auto it_ = it; it_ != sent; ++it_)
co_yield *it_;
}
}something like that..) (hopefully without allocation)

ср, 26 окт. 2022 г. в 17:19, Phil Bouchard via Std-Proposals <
std-proposals_at_[hidden]>:

>
> On 10/26/22 09:04, Dave Brown via Std-Proposals wrote:
>
> This was earlier proposed as P0059, but appears to have seen little work
> in the last few years.
> Note, however, that this is a span-like container and doesn't own the
> elements. You need to
> create an array and apply the ring_span to it.
>
> I would be interested in seeing this picked up again.
>
> http://wg21.link/p0059
>
> /Dave
>
> Yeah or even better: the ring_span could be a derivative class of any
> arbitrary container:
>
> template <typename T, typename C, class Popper = default_popper<T>>
>
> class ring_span : public C
>
> {
>
> [...]
>
> };
>
> ring_span<std::array<int, 5>> Q(std::begin(A), std::end(A));
>
>
>
> On Wed, 26 Oct 2022 at 14:53, Phil Bouchard via Std-Proposals <
> std-proposals_at_[hidden]> wrote:
>
>> Greetings,
>>
>> I'm surprised this is not part of the standard library yet:
>>
>>
>> https://www.boost.org/doc/libs/1_49_0/libs/circular_buffer/doc/circular_buffer.html
>>
>> As it is 5 times the speed of a deque and list:
>>
>>
>> https://www.codeproject.com/Articles/1185449/Performance-of-a-Circular-Buffer-vs-Vector-Deque-a
>>
>> This container is pretty useful as I must have used it 3-4 times in
>> different projects over the last 2 years (rotating log files, buffering for
>> AI algorithms and preemptive recording of videos).
>>
>> I encourage its integration because not everybody wants to use the Boost
>> library given its complexity to manage.
>>
>>
>> Regards,
>> --
>> [image: Logo] <https://www.fornux.com/>
>> *Phil Bouchard* [image: facebook icon]
>> <https://www.linkedin.com/in/phil-bouchard-5723a910/>
>> CTO
>> T: (819) 328-4743
>> E: phil_at_[hidden] | www.fornux.com
>> 1188 rue Saint-Louis | Gatineau (Qc), J8T 2L8 Canada
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>> --
>> Std-Proposals mailing list
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>>
>
>
> --
> David Brown
> Puffinpack
> Mobile: +46 735 231 242
>
> --
> [image: Logo] <https://www.fornux.com/>
> *Phil Bouchard* [image: facebook icon]
> <https://www.linkedin.com/in/phil-bouchard-5723a910/>
> CTO
> T: (819) 328-4743
> E: phil_at_[hidden] | www.fornux.com
> 1188 rue Saint-Louis | Gatineau (Qc), J8T 2L8 Canada
> [image: Banner] <https://goglobalawards.org/> Le message ci-dessus, ainsi
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> confidentielles ou ne pouvant être divulguées. Si vous avez reçu ce message
> par erreur, veuillez le détruire.
> This communication (and/or the attachments) is intended for named
> recipients only and may contain privileged or confidential information
> which is not to be disclosed. If you received this communication by mistake
> please destroy all copies.
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>