Its reference count gets increased by copy constructor & operator = while
returned from createInstance().
On Tue, May 19, 2009 at 4:15 PM, xie <yili....@gmail.com> wrote:
>
> hi Dianne~~
>
> thanks for you answer~~ i have implmented the camera hal with v4l2,
> although i used the below source, i still have some confusion. I think
> the below source is a singleton mode, if the object have been freed we
> will creat a new object . when i creat a new object with this code :
>
> sp<CameraHardwareInterface> hardware(new CameraHal());
>
> i think the "hardware" is a temp variable, it will be deleted when the
> function return. And the sp is a smartpointer ,it will free the object.
> But i am wrong in fact , the object have not been deleted. Can you tell
> my where i am wrong ~~
>
> thanks very much
>
> sp<CameraHardwareInterface> CameraHal::createInstance()
> {
> LOG_FUNCTION_NAME
>
> if (singleton != 0) {
> sp<CameraHardwareInterface> hardware = singleton.promote();
> if (hardware != 0) {
> return hardware;
> }
> }
>
> sp<CameraHardwareInterface> hardware(new CameraHal());
>
> singleton = hardware;
> return hardware;
> }
>
>
> 在 2009-05-19二的 00:43 -0700，Dianne Hackborn写道：
> > sp == strong pointer, wp == weak pointer.
> >
> > The object will remain around while there are strong pointers; it is
> > destroyed once the last one is released. All you can do with a weak
> > pointer is comparison and attempting to promote to a strong pointer;
> > the latter will fail if there are no other strong pointers on the
> > object.
> >
> > On Mon, May 18, 2009 at 11:56 PM, xie <yili....@gmail.com> wrote:
> >
> > Dear all :
> >
> > when i read the android source, i find that "<sp>" is not only
> > a smart
> > pointer,it manage a strong ref count and i also find that the
> > <wp>
> > manage a weak ref count .
> >
> > who can tell me how the two kinds of pointer works together,
> > when will
> > the object be freed?
> >
> > thanks a lot
> >
> >
> >
> >
> >
> >
> > --
> > Dianne Hackborn
> > Android framework engineer
> > hack...@android.com
> >
> > Note: please don't send private questions to me, as I don't have time
> > to provide private support, and so won't reply to such e-mails. All
> > such questions should be posted on public forums, where I and others
> > can see and answer them.
> >
> >
> > >
>
>
> >
>
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