[Vala] Fwd: Sharing a trick to use some C macros in VALA

[Feng Yu <rainwoodman gmail com>]

GMAIL doesn't want me to post to the list. :(

---------- Forwarded message ----------
From: Feng Yu <rainwoodman gmail com>
Date: Fri, Nov 6, 2009 at 11:14 AM
Subject: Re: [Vala] Sharing a trick to use some C macros in VALA
To: Sam Liddicott <sam liddicott com>
Cc: Jürg Billeter <j bitron ch>


I am thinking of the <Type> syntax.

---VALA---
[CCode (type_symbol_pos=-1)]
talloc_zero<T1>(void * memctx);

--CCODE--
talloc_zero(void * memctx, T1) ?


To me, this syntax is consistent with the VALA style.
It also reflects the fact that the function is a templated function.
Notice that this syntax allows only one type template.

As a reference, currently for the GObject backend,
we are compiling the templated function into something like
talloc_zero(void * memctx, _dup_func, _free_func_, ...)

Will a patch for this be welcomed? Who can write one?

Regards,

Yu








On Tue, Nov 3, 2009 at 3:14 AM, Sam Liddicott <sam liddicott com> wrote:

> * Feng Yu wrote, On 03/11/09 00:55:
>
> > import themwith Pragmas
>
> You mean that a pragma would identify that an argument took a C type?
>
> e.g.
>
> talloc_zero(void* memctx, [argtype="typesymbol"] typesymbol);
>
> Sam
>
>
>  On Nov 2, 2009 2:03 PM, "Sam Liddicott" <sam liddicott com <mailto:
> > > sam liddicott com>> wrote:
> > >
> > > To get some of these tricks to work it would be helpful to be able to
> > > pass the  C type underlying the vala type as a macro parameter.
> > >
> > > I've a bug with patches that does this using typeof() to emit the C
> > > typesymbol but it doesn't meet Juerg's syntax expactations.
> > >
> > > As interfacing with c macros is topical again, does anyone have ideas on
> > > this?
> > >
> > > Sam
> > >
> > > -----Original Message----- From: pancake <pancake youterm com <mailto:
> > > pancake youterm com>> Sent: 01 November 2009 10:29 To: Yu ...