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Exception Vs Error Code C


Sep 8 '09 at 0:28 add a comment| up vote 4 down vote Exceptions compared to true/false and error codes have several important advantages: Exceptions cannot be ignored. Use assert when you have an invariant; something that should never happen. with friends. return -1; } Number diff = x.sub(y, rc); if (rc == Number::Overflow) { // ...code that handles overflow... navigate here

I cannot say a similar thing about user-triggered exceptions, because obviously there are some in correct code; so now it's a question of who calls who. invalid state (the report_generator is a FSM) no device is active error during report generation Which error-handling mechanism is best for these errors? Each time it executes you have to make sure it succeeded, or otherwise exit. You'll also want to add an if to your other member functions: if the object is a zombie, do a no-op or perhaps something more obnoxious. http://stackoverflow.com/questions/253314/exceptions-or-error-codes

Exception Error Code Java

So you use them only for programmer errors, which you can't fix by using error codes anyway. For example, rather than allocating memory into a raw Fred* data member, put the allocated memory into a "smart pointer" member object, and the destructor of this smart pointer will delete Changed the example. –Ed S. Unlike most languages, Go enables you to return multiple values from a function without creating some ad hoc data structure or object to do it.

Cutting my kid loose from my PS account? in Go open_the_gate() wait_for_our_men_to_come_in() close_the_gate() You may expect the gate to always close while in fact a panic() can be thrown in extreme cases of wait_for_our_men_to_come_in, and bam, your gates are share|improve this answer answered Oct 31 '08 at 12:39 Maxam 3,24721625 add a comment| up vote 11 down vote Exceptions over error codes, no doubt about it. Error Handling Exception Handling And Memory Leakage Can Be Determined By return -1; } else if (rc == Number::Underflow) { // ...code that handles underflow...

Exceptions are the only fit for crisis management of **unexpected/undocumented** error types. The Exception That Grounded An Airline Consider an error detected in a constructor; how do you report the error? But occasionally it still just crashes or locks up. http://stackoverflow.com/questions/1388335/exception-vs-error-code-vs-assert Why not just use an object of some string class?

None of this clutter happens with exceptions. C++ Error Codes Same goes for any framework: when in Rome, do as the Romans. Of course it's not true that the busted program can judge the extent of damage due to proceeding vs not proceeding… Here you can have atexit handlers or some such, attempting If an error code doesn't get checked and appropriate actions aren't taken in response to a bad error code, the program will keep on doing what it's doing and who knows

The Exception That Grounded An Airline

Error codes have another horrible anti-debugging quality: loss of information. Asking help about a typedef expression Should I list "boredom" as a reason for leaving my previous job in an interview? Exception Error Code Java Here's why (buckle your seat-belts): The C++ rule is that you must never throw an exception from a destructor that is being called during the "stack unwinding" process of another exception. Exceptions Vs Return Codes C++ share|improve this answer answered Dec 4 '09 at 20:39 Anon. 34.7k45678 1 What if you have a tight loop that performs an operation that can fail?

And on large, fast-moving systems, both effects tend to be highly undesirable. check over here Another way is to return an object that contains the error code and the real return value. But certainly at least 99% of the time this is a good rule of thumb. if ($hasNotValidCredentials) { throw new \RuntimeException("Invalid credentials", self::INVALID_LOGIN_CREDENTIALS); } // ... // Some validation to check if the user has attempted too many times to login // ... Which Type Of Testing Requires Stubs And Drivers

Main point is to ask "Why?". And you'll leave town if you know what's good for you. Exception classes cross subsystem boundaries -- they are part of the intellectual glue that holds the architecture together. http://radionasim.com/error-code/fd-error-code-maytag-code.php Further, to avoid requiring readers to understand the entire call graph, exception-safe code must isolate logic that writes to persistent state into a "commit" phase.

Making all the intermediate methods conscience about this kind of behavior and havingĀ to returnĀ it. C++ Exceptions Best Practices Furthemore, they can implicitly unwind stack too if desired. return -1; } else if (rc == Number::Underflow) { // ...code that handles underflow...

Is the only way we can have reliable software is by having perfect software?

What if another thread or some other code already sees the state change and acted on it? For example, IMHO, a general file_open function should not throw an exception, if the file doesn't exist. This FAQ gives you a list of some of those wrong mindsets. Difference Between Exception And Error In C++ So I think it makes sense for Go - a language for writing critical production code - to shun exceptions.

If it didn't throw an exception, it would calculate values out of range of the storage they were in, which would just as surely crash the vehicle. That definitely inhibits optimizations, as not only it's an extra argument to pass, but the variable that will store the result can no longer be a register variable (unless the compiler How can I handle a constructor that fails? weblink But what if the real world worked differently?

share|improve this answer answered Oct 31 '08 at 13:03 Tom Dunham 3,34412124 I found two of those posts to be very interesting (I didn't read the "and"), but particularly Because exceptions scale better than return-codes. So what can we do? Note: if a constructor finishes by throwing an exception, the memory associated with the object itself is cleaned up -- there is no memory leak.

You incur cost only when you have an error. "But in JSF++ Stroustrup himself bans exceptions outright!" JSF++ is for hard-real time and safety-critical applications (flight control software). 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. If you solve the first problem by consistently not using new in the throw (and therefore consistently not using delete in the catch), then you probably won't be able to allocate Pentest Results: Questionable CSRF Attack more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life

Certainly you should prefer exceptions over zombie objects, but if you do not have the option of using exceptions, zombie objects might be the "least bad" alternative.