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Bug 3280 – comparing array length is wonky

Status: RESOLVED
Resolution: INVALID
Severity: normal
Priority: P2
Component: dmd
Product: D
Version: D2
Platform: Other
OS: Linux
Creation time: 2009-09-01T16:39:00Z
Last change time: 2015-06-09T01:28:08Z
Assigned to: nobody
Creator: ellery-newcomer

Comments

Comment #0 by ellery-newcomer — 2009-09-01T16:39:31Z

void main(){ string s; int a = s.length; assert(a == 0); assert(s.length == 0); assert(a == 0); assert(a > -1); assert(s.length > -1); //fails }

Comment #1 by jarrett.billingsley — 2009-09-01T17:09:24Z

Sorry, invalid. typeof(s.length) is unsigned, typeof(-1) is signed. The compiler should throw an error on the last assert, but doesn't. Instead, it casts -1 to size_t, resulting in something like "assert(s.length > 0xFFFFFFFF);" See bug 259.

Comment #2 by jarrett.billingsley — 2009-09-01T17:09:39Z

Oops