Re: Proposal: A block between "try" and "catch".

From:
Alexis Guillaume <alexis.c.guillaume@gmail.com>
Newsgroups:
comp.lang.c++.moderated
Date:
Tue, 10 Jun 2008 21:07:23 CST
Message-ID:
<1642b73c-b9f1-4eb8-b054-2906f42d6827@l42g2000hsc.googlegroups.com>
On 6 juin, 17:57, Carl Barron <cbarron...@adelphia.net> wrote:

    well lets get smaller:
    bool do_rethrow = false;
    try
    {

       Object obj("data");
       do_rethrow = true; // ct0r did not throw
       do_something_else(ob,"something");
    }
    catch (range_error &e)
    {
       if(do_rethrow)
          throw;
       else
       {
          ....
       }
    }


As new syntax proposals seem to be welcomed, here are my two cents :

try (bool do_rethrow = false)
// All variables declared in the parenthesis are valid only in the try-
catch block
{
     Object obj("data");
     do_rethrow = true; // ct0r did not throw
     do_something_else(ob,"something");
} catch (range_error &e) {
     if (do_rethrow) {
          throw;
     } else {
        // ...
     }
}

This would avoid the clutter of an extra out of scope variable, or an
anonymous scope. Plus, I find it quite clear. Yet I'm fairly certain
that this new syntax comes with many problems I didn't foresee, and
I'm curious to know what they are...

--
Alexis Guillaume

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