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

Subject: Re: [boost] very simple implementation of Andrei Alexandrescu's ScopeGuard idiom
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2012-09-04 08:06:34

Lorenzo Caminiti wrote:
> <Robert.Stewart_at_[hidden]> wrote:
> > Sergey Radionov wrote:
> >>
> >> <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.
> >
> > 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.

No one suggested that the above *can* execute "arbitrary code" as
you define it for Boost.Scope Exit.  However, in my experience,
what's needed is to call a function with a few arguments in
nearly all cases, and I'm happy to relying on binding and lambdas
to handle the others.

> > There's also Boost.Scope Exit, though it's even more
> > verbose:
> >
> >    BOOST_SCOPE_EXIT(&file)
> >    {
> >       fclose(file);
> >    }
> >    BOOST_SCOPE_EXIT_END
> >

I referenced Boost.Scope Exit because the OP wondered why there was no facility in Boost to do what he proposed.  I pointed out that there is, though it is rather verbose by comparison.

[snip signature block, etc.]

Please don't overquote.

_____
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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