NSAssert(self.data != nil, @"Argument must be non-nil");
#define NSAssert(condition, desc, ...) \
do { \
__PRAGMA_PUSH_NO_EXTRA_ARG_WARNINGS \
if (!(condition)) { \
NSString *__assert_file__ = [NSString stringWithUTF8String:__FILE__]; \
__assert_file__ = __assert_file__ ? __assert_file__ : @"<Unknown File>"; \
[[NSAssertionHandler currentHandler] handleFailureInMethod:_cmd \
object:self file:__assert_file__ \
lineNumber:__LINE__ description:(desc), ##__VA_ARGS__]; \
} \
__PRAGMA_POP_NO_EXTRA_ARG_WARNINGS \
} while(0)
#endif
