On 03/29/2018 05:16 PM, Ivan Kazmenko wrote:
int delegate () [] guns;
foreach (i; 0..2) guns ~= () => i;
foreach (i; 0..2) writeln (guns[i] ()); // 1 and 1, why?
Because there's only variable `i`. All delegates refer to that same one.
With `i` being mutable, this could maybe be argued to be acceptable.
int delegate () [] huns;
foreach (i; 0..2) {
immutable int j = i;
huns ~= () => j;
}
foreach (i; 0..2) writeln (huns[i] ()); // 1 and 1, why?
Same here. There's only one `j`. With immutable, this is certainly a
problem. https://issues.dlang.org/show_bug.cgi?id=2043
Two possible workarounds:
int delegate () [] iuns;
foreach (i; 0..2) iuns ~= (j) { return () => j; } (i);
foreach (i; 0..2) writeln (iuns[i] ()); /* 0 and 1 */
static struct S
{
int i;
int m() { return i; }
}
int delegate () [] juns;
foreach (i; 0..2) juns ~= &(new S(i)).m;
foreach (i; 0..2) writeln (juns[i] ()); /* 0 and 1 */
