Hi,
I get the error (Lvalue required as left operand of assignment) for this code:
[[addAlertViewController alertsArray] = [NSMutableArray arrayWithObjects:nil] retain];
How can I fix it?
views:
77answers:
3
A:
Try this :
addAlertViewController.alertsArray = [[NSMutableArray arrayWithObjects:nil] retain];
However, if you have declared alertsArray property to retain, then you don't need to send the retain message.
taskinoor
2010-07-07 09:33:46
Thanks, it fixed that but now I get other error:request for member 'alertsArray' in something not a structure or union
Guy Dor
2010-07-07 09:36:41
You haven't declared the property. Before asking in this site, you should first learn the basics of C and iPhone programming. These are all basic things which can be solved by googling and reading some texts.
taskinoor
2010-07-07 09:53:24
Actually, more likely he has declared the property but hasn't imported the header file into the file he is getting the error in.
JeremyP
2010-07-07 14:14:35
true. that also might be the case.
taskinoor
2010-07-07 16:09:43
A:
The appropriate Code is as follows:
[addAlertViewController setAlertsArray:[NSMutableArray arrayWithObjects:nil]];
Be careful that you have declared in your @interface of addAlertViewController's Class:
@property (nonatomic, retain) NSMutableArray *alertsArray;
And in your implementation file
@synthesize alertsArray;
Stephen Furlani
2010-07-07 13:25:11
+1
A:
Knowing what an lvalue and rvalue will help when deciphering compiler warnings. A lvalue is something that will be assigned and a rvalue is something that can do the assigning. More info on wikipedia
An rvalue can also be a lvalue, like in the case of a = b = c (where c is an rvalue to lvalue b, but then b is a rvalue to the lvalue a).
anytime you see "lvalue required" then look on the left of the = operator, there is an error there.
Brent Priddy
2010-07-09 03:14:49