On Thursday, 14 December 2017 at 16:38:26 UTC, Steven
Schveighoffer wrote:
So enumerate returns as its element type a Tuple. Specifically,
it's going to be a Tuple!(size_t, int), since you are
enumerating an array of ints.
I'm not sure why you are having the error, compiling your code
above works perfectly fine for me. It would help to know:
a) which version of the compiler you are using?
Tried with dmd v2.077.1. Also with LDC 1.6 (which uses dmd
v2.076.1)
b) if the above actually does compile for you, what is the
minimal code that does not?
Yes of course, here's a minimal program that does not compile for
me:
import std.stdio, std.algorithm, std.range, std.array;
int rotate(int[] lengths) {
foreach(skip, length; lengths.enumerate) {}
return 0;
}
auto knotHash(string input) {
return [1].rotate();
}
auto data = ["string"]
.map!knotHash
.array;
void main() {}
The above code, however, will compile with any of the following
changes, and I don't understand why for any of them:
1) remove .enumerate
2) move the auto data inside the body of main
3) remove the call to .array
All that aside, you may not realize, this works as well:
foreach(skip, length; lengths)
Sweet, thanks! Yeah that works too.
Another thing I realized is that if I switch from .enumerate to
the foreach you suggest (in my non minimized example) the compile
time increases by A LOT. From about 1 second to 70 seconds.
