chunks equivalent with unpacking?
bearophile
bearophileHUGS at lycos.com
Wed Jul 31 11:19:01 PDT 2013
> template Iota(int stop) {
> static if (stop <= 0)
> alias TypeTuple!() Iota;
> else
> alias TypeTuple!(Iota!(stop-1), stop-1) Iota;
> }
Silly me, that Iota is not needed:
import std.stdio : writeln;
import std.range: chunks, Chunks, iota;
import std.string: format, join;
import std.typecons: tuple;
import std.algorithm: map;
struct TupleChunks(size_t n, CR) {
CR cr;
@property bool empty() { return cr.empty; }
void popFront() { cr.popFront; }
@property front() {
mixin("return tuple(" ~
n.iota.map!(i => format("cr.front[%d]", i)).join(",
") ~
");");
}
}
TupleChunks!(n, Chunks!R) tupleChunks(size_t n, R)(R r) {
return typeof(return)(chunks(r, n));
}
void main() {
float[] arr = [ 0.0, 0.15, 0.0, 1.0,
0.25, -0.25, 0.0, 1.0,
-0.25, -0.25, 0.0, 1.0];
foreach (x, y, z, w; arr.tupleChunks!4)
x.writeln;
}
(It still doesn't work, but it doesn't work in a better way).
Bye,
bearophile
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