On Fri, 15 Jan 2010 21:18:11 +0100 Jiří Zárevúcky <zarevucky.j...@gmail.com> wrote:
> pancake píše v Pá 15. 01. 2010 v 08:42 +0100: > > Is there a way to define them? I need it to solve some warnings for > > the vapis describing some C functions accepting const char* as argument. > > > > As I see in the compiler source is that it is not supported. Only for > > struct or class definitions with [Immutable]. > > > > Right, it isn't at the moment as far as I know. > > > Are there plans to support it for variables?if it is just to handle > > function signatures correctly.. > > > > I'm all for it. [Immutable] attribute for parameters would do great IMO. > Or perhaps immutable keyword as a type modifier? That would allow > binding some non-trivial array types, but I'm not sure whether that's > necessary. I have some warnings related to this in the radare2 vapi bindings. For example, you have a function that returns a const buffer, which is contained in a read-only section. If you get this buffer from vala, there's no way to represent that situation, so you are asigning a const buffer to a non-const buffer which results in a warning and the possibility to try to modify this buffer which shouldnt be permitted. I also like the 'immutable' keyword, but I think that Jürg said that he prefered [Immutable] attribute before the variable name. int write (int fd, [Immutable] void *buffer, int length); int write (int fd, immutable void *buffer, int length); for me, the second form is nicer, but this forces to create a new keyword which is probably undesired, but if you try to use attributes somewhere else than before a struct, class or method definition you get an error, so it will not be backward compatible. For methods like this: immutable string get_description (); the compiler should understand that the returned string shouldnt be modified, so it doesnt requires to be freed and cannot be modified. Something like a weak or unowned one, but with the property that no write operations can be done on it. --pancake _______________________________________________ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
