Re: Macro to output an NSString containing function name, line number plus a string with a variable number of arguments?
Re: Macro to output an NSString containing function name, line number plus a string with a variable number of arguments?
- Subject: Re: Macro to output an NSString containing function name, line number plus a string with a variable number of arguments?
- From: Christiaan Hofman <email@hidden>
- Date: Wed, 18 Apr 2012 00:51:26 +0200
On Apr 18, 2012, at 0:36, Marco S Hyman wrote:
>>
>> So far, my latest try is this:
>>
>> #define FileLog(format, ...) {\
>> return [NSString stringWithFormat:@"\n %s [Line %d] \n %@", __PRETTY_FUNCTION__, __LINE__, [NSString stringWithFormat:(format), ##__VA_ARGS__]];\
>> }
>>
>
> Change that to something that looks like a statement. One that you
> can add a ; to is even better. The "standard" way to do that is
>
> #define FileLog(format, ...) do { \
> return [NSString stringWithFormat:@"\n %s [Line %d] \n %@", \
> __PRETTY_FUNCTION__, __LINE__, [NSString stringWithFormat:(format), \
> ##__VA_ARGS__]]; } while (0)
>
> Marc
Apart from that, a "return" in a macro is almost certainly not what you want. A macro is not a function in any way.
Christiaan
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