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

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  1. POIs there a favored idiom for mimicing Java's try/finally in C++?
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    <p>Been doing Java for number of years so haven't been tracking C++. Has <strong><em>finally</em></strong> clause been added to C++ exception handling in the language definition?</p> <p>Is there a favored idiom that mimics Java's try/finally?</p> <p>Am also bothered that C++ doesn't have an ultimate super type for all possible exceptions that could be thrown - like Java's Throwable class.</p> <p>I can write:</p> <pre><code>try { // do something } catch(...) { // alas, can't examine the exception // can only do cleanup code and perhaps rethrow, ala: throw; } </code></pre> <p><strong>ADDENDUM EDIT:</strong></p> <blockquote> <p>I ended up accepting the answer that had the most up votes, i.e., use destructors to do cleanup. Of course, from my own comments, it is clear I don't entirely agree with that. However, C++ is what it is and so in the application endeavor I have in mind, I'm going to more or less strive to adhere to common community practice. I'll use template classes to wrap resources that don't already have a class destructor (i.e., C library resources), thus bestowing on them destructor semantics.</p> </blockquote> <p><strong>NEW ADDENDUM EDIT:</strong></p> <blockquote> <p>Hmm, instead of <strong><em>finally</em></strong> then a closure feature perhaps? A closure combined with ScopeGuard approach (see one of the answers below) would be a way to accomplish cleanup with arbitrary actions and access to the cleanup code's outer scope context. Cleanup could be done in the idiom fashion that is seen in Ruby programming where they supply cleanup blocks when a resource is being opened. Isn't a closure feature being considered for C++?</p> </blockquote>
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    1. COAs most of the answers point out, C++ doesn't need to mimic try/finally, it has a better solution. About the Throwable class, C++ has std::exception. It doesn't *require* that all exceptions derive from this, but it's a common convention and you can generally rely on it being followed.
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    2. COJust curious what your rationale is against the C++ RAII idiom?
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    3. COI have very minimal program I want to write but want to have a bit of robustness in terms of using try block exception handling per C++. Yet am told have to drag in template stuff to do some very elementary cleanup for C API resources instead of just using simple innate language feature like finally
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