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-rw-r--r--dom/media/SelfRef.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/dom/media/SelfRef.h b/dom/media/SelfRef.h
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+++ b/dom/media/SelfRef.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/. */
+
+#ifndef SELF_REF_H
+#define SELF_REF_H
+
+#include "mozilla/Attributes.h"
+
+namespace mozilla {
+
+template <class T>
+class SelfReference {
+ public:
+ SelfReference() : mHeld(false) {}
+ ~SelfReference() {
+ NS_ASSERTION(!mHeld, "Forgot to drop the self reference?");
+ }
+
+ void Take(T* t) {
+ if (!mHeld) {
+ mHeld = true;
+ t->AddRef();
+ }
+ }
+ void Drop(T* t) {
+ if (mHeld) {
+ mHeld = false;
+ t->Release();
+ }
+ }
+
+ MOZ_IMPLICIT operator bool() const { return mHeld; }
+
+ SelfReference(const SelfReference& aOther) = delete;
+ void operator=(const SelfReference& aOther) = delete;
+
+ private:
+ bool mHeld;
+};
+
+} // namespace mozilla
+
+#endif // SELF_REF_H