The problem that took him 5 years to fix in C++, I solved in a minute with D
Basile B.
b2.temp at gmx.com
Thu Mar 10 16:21:13 UTC 2022
On Thursday, 10 March 2022 at 02:01:01 UTC, matheus wrote:
> Hi,
>
> Today someone sent me this video:
> https://www.youtube.com/embed/ABg4_EV5L3w
> (C++ Weekly - Ep 313 - The `constexpr` Problem That Took Me 5
> Years To Fix!).
>
> It's a 26 minute long video of a guy trying to generate a
> concatenated string during CT in C++.
>
> I was flabbergasted by the problems this poor guy had in front
> of him for a thing that shouldn't seem so complex (In my
> opinion of course). And more yet that he has being struggling
> with this for 5 years.
>
> So I decided to try the same with D, it was 14 lines[1] of code
> written in less than a minute and it just worked on the first
> try. Then I looked the Assembly code:
>
> .L.str:
> .asciz "hello world, hello world, hello world, "
>
> After that I even asked over the D IRC channel if it was just
> this? And a user confirmed that my string was being generated
> through CT as the Assembly indicated.
>
> Again incredible. My first programming language was C, then in
> 2000-ish I had my first contact with C++ and I just hated and
> went back to C and then while looking for alternatives I
> stumbled on D which I use till this day as a "super C".
>
> But now after so many years I couldn't believe the C++ is still
> struggling even to this day with this type of thing.
>
> I'd like to quote this comment from the video:
>
>> meowsqueak:
>> "Well done solving this puzzle, but I’m left in shock. The
>> need to employ a template, static constexpr variables, a
>> lambda function, and four utility functions just to
>> compile-time generate a static string in C++ is an
>> embarrassment."[2]
>
> And indeed it is an embarrassment. Well D may have it flaws but
> I always found it lot time better or less restrictive language
> compared to others, especially C++.
>
> Finally I'd like to take this moment and thank for all the
> effort.
>
> Matheus.
>
> [1] - Here is the snippet I wrote:
> https://godbolt.org/z/MsT36Prx4
> [2] - Youtube comment:
> https://www.youtube.com/watch?v=ABg4_EV5L3w&lc=Ugzb7kTLS8GNS9bK07F4AaABAg
>
> PS: I'm a ESL, sorry for any English mistakes.
`~`
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