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26 #ifndef RefCountedSupplement_h
27 #define RefCountedSupplement_h
29 #include "platform/Supplementable.h"
30 #include "wtf/RefCounted.h"
31 #include "wtf/RefPtr.h"
36 template<class T, class S>
37 class RefCountedSupplement : public RefCounted<S> {
39 typedef RefCountedSupplement<T, S> ThisType;
41 virtual ~RefCountedSupplement() { }
43 class Wrapper FINAL : public Supplement<T> {
45 explicit Wrapper(PassRefPtr<ThisType> wrapped) : m_wrapped(wrapped) { }
46 virtual ~Wrapper() { }
47 #if SECURITY_ASSERT_ENABLED
48 virtual bool isRefCountedWrapper() const OVERRIDE { return true; }
50 ThisType* wrapped() const { return m_wrapped.get(); }
52 virtual void trace(Visitor*) OVERRIDE { }
56 RefPtr<ThisType> m_wrapped;
59 static void provideTo(Supplementable<T>& host, const char* key, PassRefPtr<ThisType> supplement)
61 host.provideSupplement(key, adoptPtr(new Wrapper(supplement)));
64 static ThisType* from(Supplementable<T>& host, const char* key)
66 Supplement<T>* found = static_cast<Supplement<T>*>(host.requireSupplement(key));
69 ASSERT_WITH_SECURITY_IMPLICATION(found->isRefCountedWrapper());
70 return static_cast<Wrapper*>(found)->wrapped();
75 } // namespace WebCore
77 #endif // RefCountedSupplement_h