Binary operator '&&' cannot be applied to two Bool operands

Question

I recently updated Xcode to the new 7.0 beta.

I did the migration with the assistant but there are a few more issues.

func saveContext () {
    if let moc = self.managedObjectContext {
        var error: NSError? = nil
        if moc.hasChanges && !moc.save() {
            NSLog("Unresolved error \(error), \(error!.userInfo)")
            abort()
        }
    }
}

On line 4 there are 4 issues: the first one is:

Binary operator '&&' cannot be applied to two Bool operands

the second one is:

Call can throw, but it is not marked with 'try' and the error is not handled

Can someone please help me?

This question has a much better title than does the duplicate, as programmers are likely to google on this confusing error message. For reference, the following declaration gives the same error message: func test() { return true && true } , Notice that the function is declared as void , i.e. ->Bool is missing. — ragnarius, Nov 21 '15 at 09:40

score 2 · Accepted Answer · answered Jun 13 '15 at 18:41

2

Here is some code that should do the trick. Remember to preceed throw statements with try and catch them.

func saveContext () {
    if let moc = self.managedObjectContext {
        if moc.hasChanges  {
            do {
                try moc.save()
            } catch {
                NSLog("Unresolved error \(error)")
                abort()
            }
        }
    }
}

answered Jun 13 '15 at 18:41

John Difool

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I get following error now: "Type 'ErrorType.Protocol' does not conform to protocol 'ErrorType'" – Luke Pistrol Jun 13 '15 at 18:46
I edited the code. Can you try with the latest update? – John Difool Jun 13 '15 at 18:48
Yes now it works fine :) thank you very much!!! – Luke Pistrol Jun 13 '15 at 18:49
Glad to hear that. Please consider approving my answer if things are satisfying for you. – John Difool Jun 13 '15 at 18:50
This is not a criticism of your answer. Where does `error` come from? It's weird that when they converted to the `throws` syntax, the `error` isn't explicity mentioned, but it's still there apparently. – vacawama Jun 13 '15 at 18:56
3

@vacawama: A plain `catch` is a shortcut for `catch let error` if I remember correctly. – Martin R Jun 13 '15 at 19:00
Yep, I used the shortcut. This acts like a 'default' in 'switch' and the syntax is nifty. – John Difool Jun 13 '15 at 20:39

Binary operator '&&' cannot be applied to two Bool operands

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