On Sun, Jun 11, 2023 at 11:57 AM Frederick Virchanza Gotham via
Std-Proposals <std-proposals_at_[hidden]> wrote:
>
> On Sat, Jun 10, 2023 at 3:39 PM Arthur O'Dwyer via Std-Proposals
> <std-proposals_at_[hidden]> wrote:
> >
> > See "The Auto() macro" for a way to do this without dummy names and with less visual noise.
> > https://quuxplusone.github.io/blog/2018/08/11/the-auto-macro/
>
>
> Here's how I do it:
>
> template<typename Lambda>
> struct OnScopeExit {
> bool active;
> Lambda f;
> explicit OnScopeExit(Lambda arg) : active(true), f(arg) {}
> ~OnScopeExit(void) { if ( active ) f(); }
> };
>
> And I put that inside a file called "auto_include.h".
>
> Then I compile all my files with "g++ file.cpp -include auto_include.h".
>
> Note that I have a boolean to make it inactive, for example:
>
> {
> OnScopeExit scoper( [](){ ::close(fd); } );
>
> // Do something that might throw
>
> // Do something else that might throw
>
> // Do a third thing that might throw
>
> // And then when we're happy it has succeeded:
> scoper.active = false; // Leave the file open
> return;
> }

I fail to understand the point of your proposal then. If a specific
object needs to be talked to, then it needs to have a unique name.