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On Wed, 2011-04-13 at 11:06 +0200, Jerome Vuarand wrote:
> QAbstractItemModel is a special kind of beast, I've got trouble
> wrapping my head around it even in C++. Qt wants total control over
> the lifetime of items.
> So the same rules as the C++ ones apply? If in C++ I can explicitly
> delete a QObject at any time (which is not the case for a
> QAbstractItemModel item, but it is for most widgets), I can let Lua
> collect it (which I agree is rarely what you want for widgets)?
Yes, the same rules apply. obj:delete() calls "delete p" on the boxed
pointer "p" in the userdata "obj" (with whatever C++ consequences) and
sets the boxed pointer to NULL. You should not use it afterwards (any
use of NULL boxed pointer uses lua_error).
o = QObject.new_local()
is equivalent to the following code:
o = QObject.new()
o.__gc = o.delete
All objects in lqt have a custom GC function that look for a __gc field
in the userdata environment, which is a table where __newindex stores
So you can let Lua collect your values, but the default operation is to
do nothing. To actually delete the boxed pointer, set the __gc field to
"delete" or just create the object with new_local().
On Tue, 12 Apr 2011 22:14:48 -0700 Paul Eggert <eggert@xxxxxxxxxxx> wrote:
PE> * emacs_gnutls_write has the same issues as emacs_write, and should
PE> be fixed the same way.
There's a pending patch (we're waiting for papers for Claudio Bley) that
changes some Emacs GnuTLS internals so I'd prefer to wait to make any
changes to the Emacs GnuTLS functions. How urgent is this?
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