exceptions vs error codes Duffield Virginia

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exceptions vs error codes Duffield, Virginia

The error might then become "No such user", or "Permission denied", etc. C++11 FQA anyone? Your remote method can return just error code instead of Exception to minimize data transfer. You'd also still have to unwind the stack to deal with finally blocks and destructors for stack-allocated objects. –Derek Park Sep 19 '08 at 5:16 I do agree that

It makes sense to deal with error codes for scripting languages. void User::AddFriend(User& newFriend) { friends_.push_back(&newFriend); ScopeGuard guard = MakeObjGuard(friends_, &UserCont::pop_back); pDB_->AddFriend(GetName(), newFriend.GetName()); guard.Dismiss(); } In D it would look even cleaner: void User::AddFriend(User& newFriend) { friends_.push_back(&newFriend); scope(failure) friends_.pop_back(); pDB_->AddFriend(GetName(), newFriend.GetName()); } This is different than the "just stop executing the action" case, because we actually need to do some additional work in the presence of the error. But the ultimate solution has to be testing.

According to the .NET FrameworkClass Library Design Guidelines "Exceptions are the standardmechanism for reporting errors. share|improve this answer answered Sep 19 '08 at 5:29 community wiki rpattabi COM wad designed to be usable by languages that don't support exceptions. –Kevin Sep 19 '08 at The code to the right is tricky… by moving GetInfo to a separate line, and set_icon to the end, the Icon object can’t be leaked (presumably set_icon is responsible for freeing Exceptions can also provide a lot more information, and specifically spell out well 'Something Went Wrong, here's what, a stack trace and some supporting information for the context' That being said,

Whereas an exception does it automatically for the laziest of programmers. So this means that "unusable state" is a blurry thing; and to me this also means that you actually can separate critical and not-so-critical code rather well much of the time. Error ranges can be of help here because if the only thing we are interested in is if we are in the presence of an error or not is simpler to Like when my web browser crashes, taking one half-composed email and 8 open web pages with it.

Correct implementation in return code flow would be 'if rmdir(...)==FAILED: pass' –MaR Feb 12 '13 at 12:14 add a comment| up vote 3 down vote I believe the return codes adds Our team think of using out parameters, because of unhandled exceptions propagation fear. Exceptions mean that you must imagine what happens if an exception is thrown anywhere in the flow. Otherwise I have to know every exception that can be thrown by every line in my function to know what it will do (Read The Exception That Grounded an Airline to

This gives an easy and consistent error-handling scheme and if done correctly it makes for much cleaner looking code. They both received a lot of attention on the internet. Join them; it only takes a minute: Sign up Exceptions or error codes up vote 62 down vote favorite 35 Yesterday I was having a heated debate with a coworker on This makes our code even more tolerant to changes and totally OCP compliant. Here you have the example of adding this new case:The new exception class would have to extend from the previously described InvalidLoginException

Should the program do some cleanup to restore the program state's consistency? If you find that while using exceptions your code gets run down with them and bloated by exception based classes you, once again, don't fully understand exceptions and how to use It's pretty easy to come up with tests that show exception-based APIs can be far faster. –Mooing Duck Jan 30 '14 at 0:04 1 @smink, Good points, but how do Teeth marks at the rear end AI problems A writer of the lame kind Low-level is easy Blogging is hard Tags animation (2) bastard (1) cel/acrylic (1) ceramics (13) hardware (17)

That is another alternative.  Just don’t use raw ptrs and make sure to review Effective C++ on auto_ptr safety. share|improve this answer answered Sep 19 '08 at 4:50 Jason Etheridge 4,52052130 1 Remember that using exceptions makes program analysis harder. –Paweł Hajdan Sep 19 '08 at 9:17 add a Developing web applications for long lifespan (20+ years) House of Santa Claus In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in They put code into the vehicle from an earlier vehicle that would not work with work with the new vehicle.

To cheat. ^_^ You can see this in… Regarding #1, should set_icon fail (throw), the NotifyIcon will be destroyed before the exception leaves this function. In other cases, what sense to user of your code to know that it was -lets say - error #23452, that was occurred. You can skip writing the bad code at all, and do all your failure handling via RAII. A common means for exposing methods whose callers may or may not expect failures is to have pairs of methods that fnorble named, e.g., TryFnorble and Fnorble.

A proper program would either check existance of the file or would open a file with the assumption, that it should be created if it doesn't exist. Are you just going to return the Result object all the way up the stack and check if ResultCode !=0 everywhere? Unless the code you're writing is time-critical, the overhead associated with unwinding the stack is not significant enough to worry about. Very little software really gets error handling right.

share|improve this answer answered Sep 21 '08 at 15:20 paercebal 52.6k30107139 1 Yeah, BUT regarding your first example, that could be easily written as: if( !doSomething() ) { puts( "ERROR Is the only way we can have reliable software is by having perfect software? He kept it in a Skoal can on his nightstand for years. Why are we limiting ourselves this way?

Exceptions should be reserved for complete failures that are unrelated to normal constraints. Bad. In practice this works very well and easily for strings object. Lavavej makes a distinction between “archaic C++” and “modern C++”[4].

Difference between good and bad EH (old style) code · Which statements / sub-expressions can throw? Making sure that the opening of every gate is exception-safe - that the gate gets closed when an exception is thrown - is hard. In C, this most often this means freeing up allocated memory. if ($hasNotValidCredentials) { throw new InvalidLoginCredentialsException(); } // ... // Some validation to check if the user has attempted too many times to login // ...

Delivering an error message to customers is generally preferable to delivering wrong data that could look to be 'real', and the latter situation is much easier to run into with a