On Monday, 18 January 2016 at 23:33:53 UTC, Jay Norwood wrote:
I'm playing with the example below. I noticed a few things.
1. The ndslice didn't support the extra index, i, in the
foreach, so had to add extra i,j.
2. I couldn't figure out a way to use sliced on the original
'a' array. Is slicing only available on 1 dim arrays?
3. Sliced parameter order is different than multi-dimension
array dimension declaration.
import std.stdio;
import std.experimental.ndslice.slice;
void main() {
int[4][5] a = new int[20];
foreach(i,ref r; a){
foreach(j,ref c; r){
c= i+j;
writefln("a(%d,%d)=%s",i,j,c);
}
}
writefln("a=%s",a);
auto b = new int[20].sliced(5,4);
int i=0;
foreach( ref r; b){
int j=0;
foreach( ref c; r){
c= i+j;
writefln("b(%d,%d)=%s",i,j,c);
j++;
}
i++;
}
writefln("b=%s",b);
}
Hi,
1. You can use std.range.enumerate or just use a normal foreach:
foreach(i; 0..slice.length!0)
{
/// use slice[i] ...
}
2. Yes (A 2D D array is an array of arrays, so slice would be a
slice composed of arrays)
3. Order is correct:
void main() {
auto a = new long[][](5, 4);
auto b = new long[20].sliced(5, 4);
foreach(i, ref r; a) {
foreach(j, ref c; r) {
c = i+j;
b[i, j] = c;
writefln("a(%d,%d)=%s", i, j, c);
writefln("b(%d,%d)=%s", i, j, b[i, j]);
}
}
writefln("a=%s",a);
writefln("b=%s",b);
}
Ilya