On Monday, 15 June 2015 at 15:10:24 UTC, jmh530 wrote:
So I suppose I have two questions: 1) am I screwing up the
cast, or is there no way to convert the MapResult to float[]
Don't cast it, just slap a .array on the end after importing
std.range. Like so:
import std.algorithm;
import std.range; // add this line somewhere
float[] exp2(float[] x) {
auto y = x.map!(a => exp(a));
return y.array; // this line changed to make the array
}
The reason is that map returns a lazy generator instead of an
array directly. It only evaluates on demand.
To get it to evaluate and save into an array, the .array function
is called.
Tip though: don't call .array if you don't have to, chaining
calls to map and such, even foreach(item; some_map_result) can be
done without actually building the array and can give more
efficiency.
