https://quuxplusone.github.io/blog/2021/12/06/views-are-boolish/

On Tue, Oct 31, 2023 at 9:45 PM Hewill Kang via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> Ranges adaptors *do* provide (explicit) operator bool since they all
> derived from ‘view_interface’.
>
> Olaf van der Spek via Std-Proposals <std-proposals_at_[hidden]>於
> 2023年11月1日 週三，04:44寫道：
>
>> On Thu, Oct 19, 2023 at 12:06 PM Alex Rozenman via Std-Proposals
>> <std-proposals_at_[hidden]> wrote:
>> > In this message I would like to suggest to use of a bool casting
>> operator as the most clean form of this function:
>>
>> Nice suggestion. ;)
>>
>> https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3509.htm
>>
>>
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>> Olaf
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