RootedRefPtr.h (1450B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this file, 5 * You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /** 8 * An implementation of Rooted for RefPtr<T>. This works by assuming that T has 9 * a Trace() method defined on it which will trace whatever things inside the T 10 * instance need tracing. 11 * 12 * This implementation has one serious drawback: operator= doesn't work right 13 * because it's declared on Rooted directly and expects the type Rooted is 14 * templated over. 15 */ 16 17 #ifndef mozilla_RootedRefPtr_h__ 18 #define mozilla_RootedRefPtr_h__ 19 20 #include "js/GCPolicyAPI.h" 21 #include "js/TypeDecls.h" 22 #include "mozilla/RefPtr.h" 23 24 namespace JS { 25 template <typename T> 26 struct GCPolicy<RefPtr<T>> { 27 static RefPtr<T> initial() { return RefPtr<T>(); } 28 29 static void trace(JSTracer* trc, RefPtr<T>* tp, const char* name) { 30 if (*tp) { 31 (*tp)->Trace(trc); 32 } 33 } 34 35 static bool isValid(const RefPtr<T>& v) { 36 return !v || GCPolicy<T>::isValid(*v.get()); 37 } 38 }; 39 } // namespace JS 40 41 namespace js { 42 template <typename T, typename Wrapper> 43 struct WrappedPtrOperations<RefPtr<T>, Wrapper> { 44 operator T*() const { return static_cast<const Wrapper*>(this)->get(); } 45 }; 46 } // namespace js 47 48 #endif /* mozilla_RootedRefPtr_h__ */