http://d.puremagic.com/issues/show_bug.cgi?id=10712
Summary: Compiletime foreach loop
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Temtaime <[email protected]> 2013-07-25 01:09:52 PDT ---
Sometimes it's neccessary to organize compiletime loop/unroll another loop for
better perfomance.
I'd make that simple template:
template IndexTuple(int e, int s = 0, T...) {
static if(s == e)
alias IndexTuple = T;
else
static if(s > e)
alias IndexTuple = IndexTuple!(e, s - 1, T, s);
else
alias IndexTuple = IndexTuple!(e, s + 1, T, s);
}
Use:
foreach(idx; IndexTuple!10)
writeln(idx); // prints 0, 1, ..., 9
foreach(idx; IndexTuple!(10, 2))
writeln(idx); // prints 2, 3, ..., 9
foreach(idx; IndexTuple!-10)
writeln(idx); // prints 0, -1, ..., -9
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