Clang Error on “Potential null dereference.”

Question

I keep getting Clang errors on the following type of code and I can\'t figure out why they\'re erroneous or how to resolve them to Clang\'s satisfaction:

+ (NSSt         


        

Answer 1

The way to do what's expected is shown in listing 3-5 in that document. With your example code:

+ (NSString *)checkForLength: (NSString *)theString error: (NSError **)error {
    BOOL hasLength = ([theString length] > 0);
    if (hasLength) return theString;
    else {
        if (error != NULL) *error = [NSError errorWithDomain:@"ErrorDomain" code:hasLength userInfo:nil];
        return nil;
    }
}