[Issue 4456] New: std.range Recurrence is horribly broken
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Tue Jul 13 17:28:40 PDT 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4456
Summary: std.range Recurrence is horribly broken
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: nobody at puremagic.com
ReportedBy: yebblies at gmail.com
--- Comment #0 from yebblies <yebblies at gmail.com> 2010-07-13 17:28:36 PDT ---
Recurrence gives incorrect values when the order of previous states is
important.
eg
recurrence!"a[n-1] + a[n-2]"(1,2) works, but
recurrence!"a[n-2]"(1,2) does not.
fix:
void popFront()
{
_state[_n % stateSize] = binaryFun!(fun, "a", "n")(
- cycle(_state, _n), _n + stateSize);
+ cycle(_state), _n + stateSize);
++_n;
}
The old values array is being offset twice, remove the argument to cycle and it
works perfectly.
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