staticIota is easy

Ali Çehreli via Digitalmars-d-learn digitalmars-d-learn at puremagic.com
Fri Dec 9 10:52:59 PST 2016


I thought I needed something like staticIota in a unittest to effect 
static foreach over a number range and I found one in druntime's 
implementation:

 
https://github.com/dlang/druntime/blob/master/src/core/internal/traits.d#L106

(I wonder why that one is implemented in divide-and-conquer fashion. 
Perhaps due to faster compilation that way?)

Then I realized that this is actually pretty easy with D:

template staticIota(size_t N) {
     import std.range: iota;
     import std.meta: aliasSeqOf;
     alias staticIota = aliasSeqOf!(N.iota);
}

unittest {
     size_t count = 0;
     foreach (i; staticIota!10) {
         mixin("++count;");
     }
     assert(count == 10);
}

void main() {
}

I realized that I don't actually need it but I wanted to share. :)

Ali

P.S. Related, I've been using D for a living since I started working for 
Weka.IO in June. (I think the only mention of that was in this blog 
post: https://dlang.org/blog/2016/06/). The more I use D, the more I 
like it but you already know it. ;)


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