Template:Computer Programming/Error Handling/2
From Wikibooks, open books for an open world
Our example make use of the fact that all valid return values for √ are positive and therefore -1 can be used as an error indicator. However this technique won't work when all possible return values are valid and no return value is available as error indicator.
[edit] Error (success) indicator parameter
An error condition is returned via additional out parameter. Traditionally the indicator is either a boolean with "true = success" or an enumeration with the first element being "Ok" and other elements indicating various error conditions.
