On 3/3/23 07:50, Jason McKesson via Std-Proposals wrote:
> On Thu, Mar 2, 2023 at 3:11 PM Andrey Semashev via Std-Proposals
> <std-proposals_at_[hidden]> wrote:
>>
>> On 3/2/23 19:13, Jason McKesson via Std-Proposals wrote:
>>> On Thu, Mar 2, 2023 at 4:12 AM Frederick Virchanza Gotham via
>>> Std-Proposals <std-proposals_at_[hidden]> wrote:
>>>>
>>>> On Thu, Mar 2, 2023 at 12:19 AM Thiago Macieira via Std-Proposals
>>>> <std-proposals_at_[hidden]> wrote:
>>>>>
>>>>>>> I'm not gonna include a header file and use that horrible syntax.
>>>>>>> Having an implicit variable called "__i" would be much better.
>>>>>>
>>>>>> What would it be called in an inner loop? __j?
>>>>
>>>>
>>>> How about the outermost is __i, and then the next inner one is __j,
>>>> then __k, until we get to __z. That would accommodate 18 nested loops.
>>>>
>>>> for ( auto &container : container_of_containers )
>>>> {
>>>> cout << __i << endl;
>>>>
>>>> for ( string &e : container )
>>>> {
>>>> cout << __i * __j << end;
>>>>
>>>> for ( char const c : e )
>>>> {
>>>> cout << __k << " originating from " << __i << endl;
>>>> }
>>>> }
>>>> }
>>>
>>> Here's a better idea: let's not make confusing, trivial changes to the
>>> language for the *minor* comfort of having an index generated by the
>>> compiler. The difference between `for(string &e: container)` and
>>> `for(auto[i, &e]: enumerate(container))` is too insubstantial to
>>> bother with. And it's not like this isn't a common idiom or anything;
>>> Python programmers do this all the time.
>>
>> Using `enumerate` requires one to include a nontrivial amount of code,
>> most of which, I presume, is unrelated to `enumerate`. And it doesn't
>> really provide that much convenience benefit in return. So given the
>> choice, I would rather avoid including the header and define the counter
>> variable myself.
>
> C++23 will have module support for the standard library. `import std;`
> will cost the same no matter how much stuff is in the standard
> library, so that's no longer a relevant concern.

Modules don't exist in my environment and won't exist for a very long
time. And their performance benefit is yet to be seen.