CODEWITHSUNDEEP
iosobjective-cmacros
user426132
user426132

Reputation: 1441

Error using variadic macro Objective-C

I have defined the following macro:

#define DSLog(x,...) [[DSLogger sharedInstance] Log:(x, __VA_ARGS__)]

@interface DSLogger : NSObject

+ (instancetype)sharedInstance;
- (void)Log:(NSString *)messageToLog,...;
- (NSArray *)errorLogArray;
@end

However I get a lot of "Expected expression" errors when I use it:

DSLog(@"setting dhcp to %ld", (long)dhcp);

Expression result unused & Implicit conversion of long to NSString is disallowed with ARC

Any ideas why this is happening and how to fix it?

Upvotes: 0

Views: 66

Answers (1)

Phillip Mills
Phillip Mills

Reputation: 31016

It looks as if the parentheses that wrap the Log parameter in the macro are causing confusion.

Try:

#define DSLog(x,...) [[DSLogger sharedInstance] Log:x, __VA_ARGS__]

Upvotes: 3

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