http://d.puremagic.com/issues/show_bug.cgi?id=5787
Summary: Invisible multiple function calls in static foreach
Product: D
Version: D2
Platform: Other
OS/Version: Windows
Status: NEW
Keywords: performance
Severity: normal
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2011-03-27 08:10:09 PDT ---
Through profiling I have found a performance problem in my code. I have later
reduced the case and created this demo code:
import std.typecons: tuple;
import std.c.stdio: printf;
auto foo() {
printf("foo\n");
return tuple(1, 2);
}
void main() {
foreach (x; foo().tupleof)
printf("%d\n", x);
}
Its output, DMD 2.052:
foo
1
foo
2
In my code foo() was an expensive computation.
In my opinion in this situation foo() needs to be computed only once (or I'd
like some other solution to avoid this invisible multiple calls, like some kind
of error, etc).
--
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
