NS_REQUIRES_NIL_TERMINATION

NS_REQUIRES_NIL_TERMINATION macro can be used to warn that method’s varargs requires nil as last argument:

- (void)something:(NSString *)name, ...  NS_REQUIRES_NIL_TERMINATION;

By default GCC doesn’t warn about missing nil (sentinel). To enable this warning:

• open Targets → select target → Get Info → Build tab
• find “Other Warning Flags” and add -Wformat

After rebuild, the warning: missing sentinel in function call warning will be presented under each method call without nil termination.

This is reblog from my older blog @ tumblr.