From: Jani Nikula <jani@nikula.org>
To: Austin Clements <amdragon@MIT.EDU>,
Vladimir Marek <Vladimir.Marek@Oracle.COM>,
Notmuch Mail <notmuch@notmuchmail.org>
Subject: Re: [PATCH 4/4] Explicitly type void* pointers
Date: Thu, 12 Apr 2012 08:02:12 +0000 [thread overview]
Message-ID: <87aa2hxtrv.fsf@nikula.org> (raw)
In-Reply-To: <87vcl6nfda.fsf@awakening.csail.mit.edu>
On Wed, 11 Apr 2012 17:11:13 -0400, Austin Clements <amdragon@MIT.EDU> wrote:
> On Mon, 09 Apr 2012, Jani Nikula <jani@nikula.org> wrote:
> > Vladimir Marek <Vladimir.Marek@Oracle.COM> writes:
> > I'm throwing in a third alternative below. Does it work for you? I think
> > it's both prettier and uglier than the above at the same time! ;)
> >
> > A middle ground would be to change the callers to use
> > "notmuch_talloc_steal", and just #define notmuch_talloc_steal
> > talloc_steal if __GNUC__ >= 3.
> >
> > One could argue upstream talloc should have this, but OTOH it's a C
> > library.
> >
> > BR,
> > Jani.
> >
> >
> > diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
> > index ea836f7..83b46e8 100644
> > --- a/lib/notmuch-private.h
> > +++ b/lib/notmuch-private.h
> > @@ -499,4 +499,22 @@ _notmuch_filenames_create (const void *ctx,
> >
> > NOTMUCH_END_DECLS
> >
> > +#ifdef __cplusplus
> > +/* Implicit typecast from 'void *' to 'T *' is okay in C, but not in
> > + * C++. In talloc_steal, an explicit cast is provided for type safety
> > + * in some GCC versions. Otherwise, a cast is required. Provide a
> > + * template function for this to maintain type safety, and redefine
> > + * talloc_steal to use it.
> > + */
> > +#if !(__GNUC__ >= 3)
> > +template <class T>
> > +T *notmuch_talloc_steal(const void *new_ctx, const T *ptr)
> > +{
> > + return static_cast<T*>(talloc_steal(new_ctx, ptr));
> > +}
> > +#undef talloc_steal
> > +#define talloc_steal notmuch_talloc_steal
> > +#endif
> > +#endif
> > +
> > #endif
>
> This looks good to me. I was originally concerned that this depended on
> talloc_steal being a macro, but I realized that's not actually the case.
> Care to roll a real patch?
Sure.
One question: the template must be outside NOTMUCH_{BEGIN,END}_DECLS
(which are just macros for extern "C" block) but should it be within the
#pragma GCC visibility push(hidden) and pop directives? I'm not familiar
with that.
Thanks for the review.
BR,
Jani.
next prev parent reply other threads:[~2012-04-12 8:02 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-09 10:17 notmuch on Solaris Vladimir.Marek
2012-04-09 10:17 ` [PATCH 1/4] Make configure use /bin/bash instead of /bin/sh Vladimir.Marek
2012-04-09 11:10 ` Jani Nikula
2012-04-09 12:19 ` Vladimir Marek
2012-04-10 17:26 ` Tomi Ollila
2012-04-11 8:43 ` Vladimir Marek
2012-04-11 18:47 ` Tomi Ollila
2012-04-30 11:58 ` David Bremner
2012-04-30 12:09 ` Tomi Ollila
2012-04-09 10:17 ` [PATCH 2/4] dirent->d_type not available on Soalris Vladimir.Marek
2012-04-09 11:17 ` Jani Nikula
2012-04-09 15:12 ` Vladimir Marek
2012-04-09 15:46 ` Adam Wolfe Gordon
2012-04-09 16:32 ` Vladimir.Marek
2012-04-11 18:57 ` Tomi Ollila
2012-04-11 19:36 ` Austin Clements
2012-04-09 10:17 ` [PATCH 3/4] Private strsep implementation Vladimir.Marek
2012-10-15 5:05 ` Ethan Glasser-Camp
2012-04-09 10:17 ` [PATCH 4/4] Explicitly type void* pointers Vladimir.Marek
2012-04-09 11:04 ` Jani Nikula
2012-04-09 18:15 ` Vladimir Marek
2012-04-09 21:31 ` Jani Nikula
2012-04-10 6:53 ` Vladimir Marek
2012-04-11 21:11 ` Austin Clements
2012-04-12 8:02 ` Jani Nikula [this message]
2012-04-12 17:57 ` Austin Clements
2012-04-15 21:05 ` Jani Nikula
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