DMD 0.148 - scope guard

[Bruno Medeiros]

Chris Miller wrote:
> On Sat, 25 Feb 2006 21:06:36 -0500, Walter Bright 
> <newshound at digitalmars.com> wrote:
> 
>> Scope guards are a novel feature no other language has. They're based on
>> Andrei Alexandrescu's scope guard macros, which have led to considerable
>> interest in the idea. Check out the article
>> www.digitalmars.com/d/exception-safe.html
>>
> 
> This format looks good to me:
> 
> scope(exit)  foo();
> scope(success)  bar();
> scope(failure)  baz();
> 
> similar to extern(name), pragma(name), etc, requires one `scope` 
> keyword, name in () doesn't need to be a keyword but is still treated 
> special, and doesn't look bad.

Here's some more experimental ideas:

   scope.onExit fooexpr;
   scope.onSuccess barexpr;
   scope.onFailure bazexpr;

Now a more clean/pure version, but that doesn't allow block statements:

   scope.onExit(fooexpr);
   scope.onSuccess(barexpr);
   scope.onFailure(bazexpr);

Don't really 100% like them, but I'll present them anyway, maybe it will 
inspire someone for a better idea. (The problem with this one is that is 
makes scope seem like a workable proper object, while it's not)

-- 
Bruno Medeiros - CS/E student
"Certain aspects of D are a pathway to many abilities some consider to 
be... unnatural."