On Monday, 15 June 2015 at 15:10:24 UTC, jmh530 wrote:
float[] exp(float[] x) {
auto y = x.map!(a => exp(a));
cast(float[]) y;
return y;
}
But I get an error that I can't convert MapResult!(__lambda2,
float[]) to float[].
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[],
2) should I just not bother with map (I wrote an alternate,
longer, version that doesn't use map but returns float[]
properly).
First off: Don't cast unless you know exactly what you're doing.
It's easy to stumble into undefined behaviour land with casts.
To answer the question: You can convert from from MapResult to
float[], but not with a cast. Instead, use std.array.array:
import std.array: array;
return x.map!(std.math.exp).array;
