Re: [boost] very simple implementation of Andrei Alexandrescu's ScopeGuard idiom

Subject: Re: [boost] very simple implementation of Andrei Alexandrescu's ScopeGuard idiom
From: Lorenzo Caminiti (lorcaminiti_at_[hidden])
Date: 2012-09-03 21:15:31

On Mon, Sep 3, 2012 at 10:28 AM, Stewart, Robert <Robert.Stewart_at_[hidden]> wrote:
> Sergey Radionov wrote:
>>
>> https://github.com/RSATom/finally_execute/blob/master/finally
>> _execute.h
>>
>> based on http://www.drdobbs.com/cpp/generic-change-the-way-
>> you-write-excepti/184403758?pgno=2
>>
>> I know about http://sourceforge.net/projects/loki-lib/ but
>> with boost::bind this can be much simpler:
>> https://github.com/RSATom/finally_execute/blob/master/README
>>
>> I've used this in many of my projects, and found it very
>> usefull....
>>
>> don't understand, why this simple solution does not
>> contributed already to Boost by someone else... :)
>
> I created a version, too, but the usage is much simpler.
>
> Given the following:
>
> FILE * const file(fopen("test", "r"));
> if (file)
> {
>    // A
> }
>
> Your usage, at A, is:
>
>    finally_execute _(make_fin_exec(boost::bind(fclose, file)));
>
> Mine is:
>
>    scope_guard _(fclose, file);
>
> As you can see, a little more complication in the component makes
> usage much simpler.

Boost.ScopeExit allows you to "execute *arbitrary* code when the
enclosing scope exits". I don't see how you execute arbitrary code
with the above.

http://www.boost.org/doc/libs/1_51_0/libs/scope_exit/doc/html/index.html

> There's also Boost.Scope Exit, though it's even more verbose:
>
>    BOOST_SCOPE_EXIT(&file)
>    {
>       fclose(file);
>    }
>    BOOST_SCOPE_EXIT_END
>
> If there's interest in it, I'd have to seek permission to submit
> my library.
>
>
> _____
> Rob Stewart                           robert.stewart_at_[hidden]
> Software Engineer                     using std::disclaimer;
> Dev Tools & Components
> Susquehanna International Group, LLP  http://www.sig.com
>
>
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-- 
--Lorenzo