How to write multiple instruction in Objective-C macro?

Question

I wonder how to write multiple instruction in Objective C macro. For example, I want to create a macro which runs two instructions below,

NSLog(message);
DDLogDebug(message);

I tried,

#define LOGMESSAGE(message) (NSLog(message);DDLogDebug(message);)

But it gave me compiler errors.

score 2 · Accepted Answer · answered Oct 08 '18 at 10:34

2

You can write multiple line macro like this:

#define LOGMESSAGE(message) \ NSLog(message); \ DDLogDebug(message); \

Or use one line version (whithout parenthesis):

#define LOGMESSAGE(message) NSLog(message);DDLogDebug(message);

answered Oct 08 '18 at 10:34

Mato Peto

Thanks a lot. It helped! – Sazzad Hissain Khan Oct 08 '18 at 12:01
3

One technique is to use a `do { ... } while (0)` wrapper as it removes the possibility of some tricky bugs. See https://stackoverflow.com/questions/154136/ – Mats Oct 08 '18 at 13:28

1 Answers1