Const Tuples

[bearophile via Digitalmars-d-learn]

> import std.typecons: Tuple, tuple;
> import std.algorithm: reduce;
>
> struct Foo { int x; }
>
> auto foo(in Tuple!(Foo[]) arg, int) {
>     return tuple(arg[0]);
> }
>
> void main() {
>     int[] data;
>     Foo[] empty;
>     auto seed = tuple(empty);
>     reduce!foo(seed, data);
> }

I have found a solution:

import std.typecons: Tuple, tuple;
import std.algorithm: reduce;

auto foo(in Tuple!(const(int)[]) arg, int) {
     return tuple(arg[0]);
}

void main() {
     int[] empty;
     Tuple!(const(int)[]) seed;
     reduce!foo(seed, [1]);
}


Bye,
bearophile