What's the quickest way to compare a NSUInteger with an int (e.g. 5) in objective-c?

Question

Background - I'm noting that the following line of code gives an error:

STAssertEquals([nsMutableArrayInstance count], 5, @"xxxx");
// gives Type Mismatch

So what I'm asking effectively is how to correct this to fix the error...

Jon Reid · Answer 1 · 2011-05-02T21:03:29.120

50

STAssertEquals requires that you compare like types to like types. So add "U" to the number to make it an unsigned literal:

STAssertEquals([nsMutableArrayInstance count], 5U, nil);

Alternatively, you could use OCHamcrest to say:

assertThat(nsMutableArrayInstance, hasCountOf(5));

edited May 02 '11 at 21:03

answered May 02 '11 at 20:56

Jon Reid

score 7 · Accepted Answer · answered Apr 28 '11 at 05:27

7

NSUInteger i = 42;
int j = 5;

if (i > j) {
  NSLog(@"the universe has not ended yet");
}

Instead of using STAssertEquals, you could use STAssertTrue:

STAssertTrue([nsMutableArrayInstance count] == 5, @"xxxx");

answered Apr 28 '11 at 05:27

Dave DeLong

1

You should also just be able to do `STAssertEquals([nsMutableArrayInstance count], (NSUInteger)5, @"xxxx")`. – Chuck Apr 28 '11 at 05:31
6

The problem with the `STAssertTrue` is that when it fails, it won't say what the actual value was. – Jon Reid May 02 '11 at 20:59
5

I encourage using `5U` as @JonReid suggests. – Eric Nov 12 '12 at 19:45

score 3 · Answer 3 · answered Sep 11 '13 at 17:10

3

Use

STAssertEquals([nsMutableArrayInstance count], (NSUInteger)5, @"xxxx");

(NSUInteger)5 does not look as clean as 5U but it will also work correctly when compiling for 64-bit.

answered Sep 11 '13 at 17:10

murat

3 Answers3