iflet.m

#import <Foundation/Foundation.h>

#define iflet(LHS, RHS) \
	for (id obj_ = (RHS); obj_ != nil;) \
		for (LHS = (obj_ ?: (RHS)); obj_ != nil; obj_ = nil)

int main(int argc, char *argv[]) {
	@autoreleasepool {
		NSString *x = nil;
		NSString *y = @"y";
		
		iflet(NSString *z, x) {
			NSLog(@"x is non-nil: %@", z);
		}
		
		iflet(NSString *z, y) {
			NSLog(@"y is non-nil: %@", z);
		}
	}
}

/* outputs:

Untitled[44105:2794964] y is non-nil: y

*/