NSException raise:format: as the last statement in a method

Question

I have this method:

+ (MHTwitterParser*)createParser:(NSString*)format {
    if ([format compare:@"json"] == NSOrderedSame) {
        return [[MHJsonTwitterParser alloc] init];
    }

    [NSException raise:@"Unknown format" format:@"Unknown format of parser"];
}

Compiler complains that:

Control may reach end of non-void function

It is just a warning, but it does not matter.

Obvious fix for that is to add for example return nil; after the [NSException raise: ....

However, I think it is not needed (and is even misleading for readers), because the exception is thrown, so it is not true that "Control may reach end of non-void function". Or am I missing something ...? Is it only compiler imperfection or there is some considerable reason for this?

The compiler is Apple LLVM compiler 3.1

Answer 1

Replacing [exception raise]; with @throw exception; is functionally the same thing and will prevent the warning (see: Throwing Exceptions).