On 07/27/2018 12:19 PM, Yuxuan Shui wrote:
On Friday, 27 July 2018 at 10:17:21 UTC, Yuxuan Shui wrote:
First, it surprised me that I can't index a struct like that. So:
struct A(T...) {
alias S = T;
alias S this;
}
alias B = A!(int, double);
B[0] x; // Actually an array
Then, it surprised me again, that I actually can index it, sometimes
static if (!is(B[0] == B[1]))
pragma(msg, "Works!");
Why is this language like this :(
Oh no, is it just defining arrays in the is() statement, though?
Yup.
But wait, this works:
alias C = A!(1,2,3);
static if (C[0] < C[1])
pragma(msg, "Ha!");
Looks like DMD decides that `C[0]` and `C[1]` can't be types in that
situation, so it tries the alias this. That's in line with how alias
this is supposed to work: only kick in when the code wouldn't compile
otherwise.
