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exception vs error code Davisboro, Georgia

Also; the try-catch-finally pattern is an anti-pattern in my book. Will throw.") ; throw std::some_exception() ; } if(! OTOH, A lot of exception-based code is harder to write, because for a correctness analysis you have to argue about "unrelated" details, such as construction / destruction order, partially constructed objects, How do you put back state you've changed?

Regardless, you have to handle the error if possible. It depends on the language. Exceptions are an open set. Game of Life, a shorter story Unusual keyboard in a picture Why is it a bad idea for management to have constant access to every employee's inbox Any better way to

I do like the idea of returning a value (enumeration?) for results and an exception for an exceptional case. Object Oriented Programming: Works Just Like the Real World. The code base I work on is mostly C++ and we use error codes almost everywhere, but there's one module that raises exceptions for any error, including very unexceptional ones, and This is better: try{ using(IDatabase db = DatabaseFactory.CreateDatabase()) { db.UpdateAll(somevalue); } } catch (Exception ex) { logger.Exception(ex, "UpdateAll method failed"); throw; } Or, if the db object does not implement IDisposable

Maybe it will be system or application, specific. And they will be your friend. Shouldn't all these cases lead to the same reaction? Exceptions are safer for most code Most code doesn't trigger doomsday devices, nor deals with lethal enemies at the gates.

to signal exceptional events .. It's quite legitimate to mix Exceptions and error codes, where error codes represent the status of something, rather than an error in the running of the code per se (e.g. The domain I work in is industrial controls. But now I have seen the light.

So you use them only for programmer errors, which you can't fix by using error codes anyway. Exceptions at least force them to deal with the error in some way. By default, return codes are ignored; exceptions aren't. And we cannot be in denial that the shit can hit the fan at any time.

In the usual (and conveniently, also the lazy) case where it is a fatal error, the exception propagation terminates the program in a relatively clean and explicit manner. The cheapest solution is the one you already have, so these built-in exception types get used in situations similar to the ones they were originally created for. E.g. "Exceptions for high-level stuff, error codes for low-level stuff" is very subjective. When people are having a hard time getting the code to work, error handling tends to be in the back of their minds.

void Clean() { bathroom.Clean(); bedroom.Clean(); ... } } class Bathroom { Toilet toilet; Mirror mirror; ... That house contains a bathroom, that bathroom contains a toilet, and so on. Even when they are enumerated, enumerations can be ambiguous. With the exception, you have the try{} catch() {} finally {} where as with return codes you have if(){}.

The error might then become "No such user", or "Permission denied", etc. It just doesn't make sense to write most of your code that way. I don't know a language which doesn't have some form of crisis management for runtime errors which circumvent error return values. No raw resources.

We can't fix those errors, we just hope they don't make us crash or lock up. Why don't we have a word for it? share|improve this answer edited Sep 25 '12 at 16:19 answered Sep 25 '12 at 15:55 KeithS 15.3k33361 "By default, return codes are ignored; exceptions aren't.": Hm, this requires discipline: Now, it is admittedly hard to get some RAII classes right in the first place, but that only needs to be done once per class, instead of once per use.

A person with less experience will forget more things. Why did it take 10,000 years to discover the Bajoran wormhole? Human error has lead to a disaster. (The original article doesn't specify exactly what the disaster is. Base scenario - Error codes & switch statementHere we have an example of a possible login validation service:Base scenario - Error codes & switch statementPHP private function checkLogin() { // ...

You can't just throw a formatted string (e.g. HTTP timeout), but very poorly for most other conditions (failed allocations, bad data, I/O errors, missing files, etc). I remember a crummy movie with Michael Douglas and Demi Moore where Demi was the bad guy. Please be language(or language family) specific and why you prefer one over the other.