On Wednesday, 16 September 2020 at 10:50:06 UTC, Daniel Kozak
wrote:
On Wed, Sep 16, 2020 at 12:00 PM Jan Hönig via
Digitalmars-d-learn < digitalmars-d-learn@puremagic.com> wrote:
...
My main question is why? Is there something, which I am
missing, that explains, why it is beneficial to return a
templated function?
(maybe, because I might want to compose together templated
non-initialized functions?)
It has to be templated because than you can alias it and use it
many times something like
import std.stdio;
import std.functional : compose;
import std.algorithm.comparison : equal;
import std.algorithm.iteration : map;
import std.array : split, array;
import std.conv : to;
alias StrArrToIntArr = compose!(array,map!(to!int), split);
void main()
{
auto str1 = "2 4 8 9";
int[] intArr = StrArrToIntArr(str1);
}
If compose would not be template it would need to store
functions addresses so it would need to have some array of
functions, this would be ineffective and need to use GC
Right, if i give it non-initialized templated functions, it makes
a lot of sense to return a template function as well.
But for functions without templates? Probably not a frequent
usecase I guess.
