[Issue 481] Letting compiler determine length for fixed-length arrays

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=481

rswhite4 at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |rswhite4 at gmail.com

--- Comment #40 from rswhite4 at gmail.com ---
(In reply to Shriramana Sharma from comment #38)
> Hmmm. I read through the thread starting at
> http://forum.dlang.org/post/mag5hp$105a$1@digitalmars.com. I think I sorta
> see the point of the developers here.
> 
> While I still think [$] is a cool little tidbit, I also have to agree with
> the comment which said "let's not add every little tidbit to the language".
> The title of the request is "letting compiler determine length for
> fixed-length arrays", not specifically to add [$]. Having the compiler
> determine the length can be done in many ways, and given that I already have
> to go to the library for a lot of commonly used stuff like writeln and to!,
> this one doesn't seem too much more. Although it *does* seem like something
> you should have out of the box, so do stuff like print()... :-)
> 
> The one thing the library solution probably cannot address would be the
> convoluted examples like a fixed-size array of a dynamic array of fixed-size
> arrays, but let's face it: those are really contrived examples and not worth
> introducing a language feature for...
> 
> I'm leaving my votes in since I do want *something* to be done to address
> the actual request, since any such library solution is ATM still sitting
> over at http://dpaste.dzfl.pl/f49a97e35974 and not actually included in
> Phobos.
> 
> BTW I don't think it should be named just 's' in the std.array module, but
> something more meaningful, like fixedLengthArray (yikes, yes I know, but I'm
> open to suggestions) and one can always do something like:
> 
> import std.array: f = fixedLengthArray;

There is a better way:
----
import std.stdio;

pragma(inline, true);
auto s(T, size_t n)(auto ref T[n] arr) {
    return arr;
}

void main() {
    auto arr = [1, 2, 3].s;
    writeln(typeof(arr).stringof);
}
---

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