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-rw-r--r--xpcom/threads/LeakRefPtr.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/xpcom/threads/LeakRefPtr.h b/xpcom/threads/LeakRefPtr.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Smart pointer which leaks its owning refcounted object by default. */
+
+#ifndef LeakRefPtr_h
+#define LeakRefPtr_h
+
+#include "mozilla/AlreadyAddRefed.h"
+
+namespace mozilla {
+
+/**
+ * Instance of this class behaves like a raw pointer which leaks the
+ * resource it's owning if not explicitly released.
+ */
+template<class T>
+class LeakRefPtr
+{
+public:
+ explicit LeakRefPtr(already_AddRefed<T>&& aPtr)
+ : mRawPtr(aPtr.take()) { }
+
+ explicit operator bool() const { return !!mRawPtr; }
+
+ LeakRefPtr<T>& operator=(already_AddRefed<T>&& aPtr)
+ {
+ mRawPtr = aPtr.take();
+ return *this;
+ }
+
+ T* get() const { return mRawPtr; }
+
+ already_AddRefed<T> take()
+ {
+ T* rawPtr = mRawPtr;
+ mRawPtr = nullptr;
+ return already_AddRefed<T>(rawPtr);
+ }
+
+ void release() { NS_RELEASE(mRawPtr); }
+
+private:
+ T* MOZ_OWNING_REF mRawPtr;
+};
+
+} // namespace mozilla
+
+#endif // LeakRefPtr_h