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iosobjective-cnsintegercgfloat

What is the equivalent of NSNotFound for floats

What if I have a method that returns a CGFloat and that method could not find an expected number, I would like to return something like NSNotFound, but that is an NSInteger.

Whats the best practice for this ?

Solution

  • You could use not a number (NaN).

    See nan(), nanf() and isnan().

    However for these issues, where there is no clearly defined non-value (it's worse with integers), then I prefer to use the following method semantics:

    - (BOOL)parseString:(NSString *)string
            toFloat:(CGFloat *)value
{
    // parse string here
    if (parsed_string_ok) {
        if (value)
            *value = parsedValue;
        return YES;
    }
    return NO;
}