[swift-evolution] #pragma

Xiaodi Wu xiaodi.wu at gmail.com
Mon Sep 5 15:31:38 CDT 2016

I agree: "mark" (IMO) is in the same category as "todo" and "fixme", and
all are bona fide comments. If you wish your code to be disabled without
becoming parsed as a comment, use instead `#if false`.

On Mon, Sep 5, 2016 at 15:27 Jean-Daniel Dupas via swift-evolution <
swift-evolution at swift.org> wrote:

> > Le 5 sept. 2016 à 00:53, isidoro carlo ghezzi via swift-evolution <
> swift-evolution at swift.org> a écrit :
> >
> > Hi all,
> >
> > I think the "old style" `#pragma` is necessary in Swift.
> > Exactly in the same way it is available in C/C++ or Objective-C/C++, or
> in something else portable way.
> >
> > Because `#pragma` is not handled in Swift, in Xcode they overloaded the
> semantic of comments, giving to the comment `// MARK:` the semantic of
> `#pragma mark`
> >
> > But my point of view is that, I would like that what it is written in a
> source comment (what it is written after a // or between /* */ ) should be
> fully ignore by compiler or IDE.
> >
> > I understand that maybe a compiler shouldn't lose time handling `#pragma
> options`, but giving semantics to source comment, I think it can be
> dangerous and misunderstood.
> >
> > The implementation in Swift compiler should be simple, ignoring any line
> beginning with `#pragma` (ok I know It is not simple)
> > The IDE will handle the `#pragma`
> >
> > That's why they invented `#pragma`in C/C++ Objective-C/C++ right?
> I don’t think it is a reason pragma exists. except for #pragma mark, I’m
> not sure the compiler ignore any pragma. They are used to control the
> compiler behaviors (controlling warning, specifying linker dependencies,
> enabled specific feature like OpenMP, etc…) and not at all to interact with
> the IDE. I would even says that pragma mark is an abuse of the #pragma
> construct as it is ignored by the compiler and used by the IDE only.
> I’m strongly again introducing #pragma without very very good reason into
> swift. Asking the IDE to parse comment to extract metadata is not worst
> abusing pragma to do the same, and at least it is forward and backward
> compatible with any other tools.
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