http://d.puremagic.com/issues/show_bug.cgi?id=4948
Summary: std.algorithm.sort asserts unexpectedly with certain
comparators
Product: D
Version: D2
Platform: x86_64
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: peter.alexander...@gmail.com
--- Comment #0 from Peter Alexander <peter.alexander...@gmail.com> 2010-09-26
14:10:13 PDT ---
The following code asserts unexpectedly when compiled with DMD 2.048 using no
flags.
void main()
{
alias Tuple!(int, "x", int, "y") V;
V[] vs = [V(3, 4), V(6, 8)];
float arg(V v) { return atan2(cast(float)v.y, cast(float)v.x); }
bool order(V a, V b) { return arg(a) < arg(b); }
sort!order(vs);
}
core.exception.asserter...@c:\D\dmd2\windows\bin\..\..\src\phobos\std\array.d(356):
Attempting to fetch the front of an empty array
It does not assert when the arg(V) function is replaced to be something more
simple, and only asserts when vs has particular values.
I suspect this has something to do with floating point inaccuracies with atan2,
but haven't looked deep enough into the issue.
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