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List:       kde-devel
Subject:    Re: OT: Re: Those dern C++ exceptions
From:       Lubos Lunak <l.lunak () sh ! cvut ! cz>
Date:       2001-08-20 9:09:11
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Dne po 20. srpen 2001 02:19 Malte Starostik napsal(a):
[snip]
>
> Even more OT, here is something that somehow combines goto-on-error and
> goto-on-success :)
> What I really liked about exception handling in Delphi is the try...finally
> construct in addition to try...except:
>
> procedure Stuff;
> var
> 	foo: TFoo;
> begin
> 	foo := TFoo.create;
> 	try
> 		// Do stuff with foo that might raise an exception
> 	finally
> 		foo.Free;
> 	end;
> end;
>
> which introduces a distinct cleanup-block that is always called, in case of
> an exception or not, something like below in C++ (note, I never used
> exceptions in C++ myself, so maybe even the syntax is wrong :)
> try..finally doesn't add actual error handling if used this way, but can
> ease proper cleanup of temporaries alot, even if they are allocated on the
> heap as there is a central place where to put all those boring delete()s :)
> If an exception is raised (thrown) during execution of the try..finally
> block, the finally...end block is executed and then the exception is raised
> as normal, if no exception is raised at all, still the complete
> try...finally...end block is executed.
>
> void stuff()
> {
> 	Foo *foo = new Foo();
> 	try
> 	{
> 		// Do stuff with foo that might throw an exception
> 		delete foo;
> 	}
> 	catch (...)
> 	{
> 		delete foo;
> 		throw(); // Not sure how this is done in C++, meant: re-throw the caught
> exception
> 	}
> }

 void stuff()
    {
    try
        {
        some_simple_smart_ptr< Foo > foo = new Foo();
	// Do stuff with foo that might throw an exception
        }
    }
    
 As your punishment, you'll write 100 times 'acquiring resources is 
initialization' :)) . Hmm, this reminds me, I wanted to send a mail about 
smart pointers to kde-devel few months ago ... maybe I should do so.

 Lubos Lunak
--
 l.lunak@email.cz     l.lunak@kde.org
 http://dforce.sh.cvut.cz/~seli


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