Glad to read this here. I agree with you about the dislike thing. I can't
stand auto_ptr, and if I had to give an object control over the life of another
object I would generally choose a shared_ptr protocol. I mean, the object
existed fine before passing it in. Why can't it survive independent of its new
owner?
On the binding side of things, it's good to know pybindgen supports this. I
really think the documentation needs an overhaul. I find reference manuals too
hard to use for learning an API. The front page of the reference (which I
nearly overlooked) has a good tutorial but it's quite incomplete. In fact, if
I wasn't aesthetically predisposed to choosing this solution, or if you didn't
answer my questions all timely-like, I would have given up. Yet it's looking
more and more like it's a nearly comprehensive (and elegant) solution so I'm
glad to stick with it.
----------------------
I know that you're thinking about the custodian_and_ward policy of
boost.python, but pybindgen also supports it. For example:
class SomeObject
{
[...]
Foobar* get_foobar_with_self_as_custodian ();
Foobar* get_foobar_with_other_as_custodian (const SomeObject *other);
void set_foobar_with_self_as_custodian (Foobar *foobar);
};
Is wrapped by pybindgen code:
SomeObject = mod.add_class('SomeObject', allow_subclassing=True)
[...]
SomeObject.add_method('get_foobar_with_self_as_custodian',
retval('Foobar*', custodian=0), [])
SomeObject.add_method('get_foobar_with_other_as_custodian',
retval('Foobar*', custodian=1),
[param('SomeObject*', 'other',
transfer_ownership=False)])
SomeObject.add_method('set_foobar_with_self_as_custodian', retval('void'),
[param('Foobar*', 'foobar', custodian=0)])
[excerpt from the pybindgen unit tests]
Although I personally dislike this sort of practice; I would hate working with
APIs this complicated even in C++.
--
Gustavo J. A. M. Carneiro
INESC Porto, Telecommunications and Multimedia Unit
"The universe is always one step beyond logic." -- Frank Herbert
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