Is there a favored idiom for mimicing Java's try/finally in C++?

Question

Been doing Java for number of years so haven\'t been tracking C++. Has finally clause been added to C++ exception handling in the language definition?<

Answer 1

Cleanup functions, themselves, are thoroughly lame. They have low cohesion, in that they are expected to perform a series of activities only related in when they happen. They have high coupling, in that they need to have their internals modified when the functions that actually do something are changed. Because of this, they're error-prone.

The try...finally construct is a framework for cleanup functions. It is a language-encouraged way to write lousy code. Moreover, since it encourages writing the same cleanup code over and over, it undermines the DRY principle.

The C++ way is far preferable for these purposes. The cleanup code for a resource is written precisely once, in the destructor. It's in the same place as the rest of the code for that resource, and therefore has good cohesiveness. The cleanup code doesn't have to be put into unrelated modules, and therefore this cuts down on coupling. It is written precisely once, when well designed.

Moreover, the C++ way is much more uniform. C++, with the smart pointer additions, handles all sorts of resources in the same way, while Java handles memory well and provides inadequate constructs to release other resources.

There are plenty of problems with C++, but this isn't one of them. There are ways in which Java is better than C++, but this isn't one of them.

Java would be much better off with a way to implement RAII instead of try...finally.