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BUG=none
TEST=none
Review URL: http://codereview.chromium.org/1623014
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@44635 0039d316-1c4b-4281-b951-d872f2087c98
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Review URL: http://codereview.chromium.org/593084
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@38951 0039d316-1c4b-4281-b951-d872f2087c98
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to ASSERT_TRUE(... == NULL). Patch by Jacob Mandelson (see http://codereview.chromium.org/202057 ), r=me.
BUG=none
TEST=none
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27511 0039d316-1c4b-4281-b951-d872f2087c98
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This required some changes to WeakPtr to support the addition
of WeakPtrFactory::HasWeakPtrs(), which is used to implement
ScopedRunnableMethodFactory::empty().
Now, the WeakReferenceOwner just holds a pointer to the Flag
class, and the Flag holds a back-pointer that it can use to
clear the WeakReferenceOwner's pointer when the Flag is
destroyed. I use the null'ness of this back-pointer in place
of the bool member that was previously used to indicate if the
WeakReference is valid.
It was also necessary to expose a HasOneRef method on
RefCounted. I included one on RefCountedThreadSafe for
completeness.
Finally, I switched HttpCache over to using WeakPtr instead
of RevocableStore so that I could delete RevocableStore.
(I'm making this change to consolidate similar functionality.)
R=abarth
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/235027
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27287 0039d316-1c4b-4281-b951-d872f2087c98
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This allows a class to hand out weak pointers to itself that will be nulled out
automatically when the class instance is destroyed.
I have provided two ways for a class to implement weak pointers. It can either
subclass SupportsWeakPtr (like subclassing RefCounted) or it can be composed of
WeakPtrFactory (like having a ScopedRunnableMethodFactory member).
Eventually, I'd like to make it possible to pass a WeakPtr<T> as the first
parameter to NewRunnableMethod. This will make ScopedRunnableMethodFactory
obsolete and should help cleanup some code.
One feature that makes the implementation here a bit more complicated is that
it is possible to pass a WeakPtr<U> to a method that takes a WeakPtr<T>
provided U "is a" T. This proved useful in RenderView, which can then give
out weak references to both itself as well as to an interface it implements.
This informed the design of WeakPtr, causing it to have a T* ptr_ member
instead of stashing that pointer within the ref counted WeakReference object.
R=brettw
BUG=none
TEST=weak_ptr_unittest.cc
Review URL: http://codereview.chromium.org/183026
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25087 0039d316-1c4b-4281-b951-d872f2087c98
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