On Thursday, 3 August 2017 at 15:29:47 UTC, jmh530 wrote:
I am trying to create a vectorize function that mixes in a new
version of function with the same name that applies the
function (to an ndslice).
The code below compiles without error and has the behavior I
would expect.
However, when I change the function import to a selective
import (e.g. from import std.math; to import std.math : sin;),
then I get errors implying that the overload is not actually
created.
Ideally, I would like to get this working with any kind of
import.
One thing I noticed is that the fullyQualifiedName of sin
changes quite a bit depending on whether you use one or the
other.
This may be related to either of the following:
https://issues.dlang.org/show_bug.cgi?id=16287
https://issues.dlang.org/show_bug.cgi?id=16023
-----------------------------------
import std.traits : isFunction;
private enum _vectorize(string f) = "
import mir.ndslice.slice : SliceKind, Slice;
auto " ~ f ~ "(SliceKind kind, size_t[] packs, Iterator)
(Slice!(kind, packs,
Iterator) slice)
{
import mir.ndslice.topology : map;
return slice.map!(f);
}
";
mixin template vectorize(alias f)
if (isFunction!f)
{
mixin(_vectorize!(__traits(identifier, f)));
}
unittest
{
import std.stdio : writeln;
import mir.ndslice.slice : sliced;
import mir.ndslice.topology : map;
import std.math; //import std.math : sin;
auto x = [0.0, 1.0, 2.0, 3.0].sliced;
auto y = x.map!(sin);
writeln(y);
mixin vectorize!(sin);
auto z = sin(x);
writeln(z);
}
I'm not 100% certain, but I believe you have to bring the
vectorized overload of sin into the overload set, so first try
`mixin vectorize!sin vsin; alias sin = vsin;` and see if it works.
https://dlang.org/spec/function.html#overload-sets
