Different loops bug
bearophile
bearophileHUGS at lycos.com
Fri Mar 1 14:07:46 PST 2013
This is derived from part of a D.learn post, maybe it's of your
interest.
This program shows two similar versions of the same loop:
import std.stdio, std.algorithm, std.typetuple, std.range;
void main() {
auto items = [[10, 20], [30]];
foreach (_; 0 .. 2) {
foreach (sub; items) {
iota(sub.length)
.map!((i){ writeln(sub); return 0; })
.array();
}
}
writeln();
foreach (_; TypeTuple!(0, 1)) {
foreach (sub; items) {
iota(sub.length)
.map!((i){ writeln(sub); return 0; })
.array();
}
}
}
Its output:
[10, 20]
[10, 20]
[30]
[10, 20]
[10, 20]
[30]
[10, 20]
[10, 20]
[30]
[30]
[30]
[30]
Do you see why the output of the two foreach(_) is different?
Bye,
bearophile
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