Re: [boost] try... catch... finally?

From: Andrey Semashev (andysem_at_[hidden])
Date: 2007-04-09 12:56:01

Hello Alexander,

Monday, April 9, 2007, 10:46:24 AM, you wrote:

> Andrey Semashev wrote:
>> Another good use case for scope guards is making rollbackable code.
>> But I see, this implementation doesn't support that.

> bool rollback = true;
> // ...

> BOOST_SCOPE_EXIT( (rollback) )
> {
>     if(rollback) do_rollback();
> }
> BOOST_SCOPE_EXIT_END

> // ...
> rollback = false; // commit

Yes, that is possible. Obviously, I didn't express myself well. I
meant, it doesn't have a special support for it. What I was thinking
is somewhat like this:

guard_stack transaction;

for (int i = 0; i < n; ++i)
{
  do_smth(i);
  transaction.push(bind(&undo_smth, i));
}

transaction.commit();

IMHO, this looks a little more cute.

-- 
Best regards,
 Andrey                            mailto:andysem_at_[hidden]