http://d.puremagic.com/issues/show_bug.cgi?id=5814
Summary: A bug with bitwise and among booleans
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2011-04-04 15:45:00 PDT ---
According to this article this D code shows a common bug:
http://www.viva64.com/en/a/0072/
void main() {
enum uint BAR = 0b011;
auto foo = 10;
auto x = !foo & BAR;
}
!foo is a boolean, and usually you don't want to perform a bitwise operation on
a boolean value. So the probable bug in that code is the usage of & instead of
&&.
(This C++ bug is caused by two design decisions: to use the two very similar
symbols && and & to denote two very different operations, and to allow mixing
boolean and integer/bitwise operations).
If this class of bugs is seen as frequent enough, then a possible design
solution to avoid them in D is for D language to not allow the bitwise
operators as & and | to have a boolean operand.
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