On 12 Nov 2008, at 10:20 pm, Graham Cox wrote:
I just added some fairly old C++ lex/bison code to my app, code that
has been in use for a long time elsewhere and works fine. My app is
compiling with much stricter warnings than many of my other projects
though, and this line is throwing a warning:
lvalp->val = strtod( --wptr, &wptr );
"warning: operation on 'wptr' may be undefined"
wptr is declared:
static char* wptr = NULL;
Can anyone shed any light on what's wrong here? Hopefully the above
is enough to go on.
Never mind, I found the answer on a comp.lang.c archive.
Seems that the order of argument evaluation can't be relied upon, so
using the same argument twice in the function call strtod may or may
not invoke the preincrement when it should. Moving the preincrement
outside the function call fixes the issue.
--Graham
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [EMAIL PROTECTED]
