import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

mfbt/RefCountType.h

@@ -0,0 +1,37 @@
+/* -*- 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 mozilla_RefCountType_h
+#define mozilla_RefCountType_h
+
+#include <stdint.h>
+
+/**
+ * MozRefCountType is Mozilla's reference count type.
+ *
+ * We use the same type to represent the refcount of RefCounted objects
+ * as well, in order to be able to use the leak detection facilities
+ * that are implemented by XPCOM.
+ *
+ * Note that this type is not in the mozilla namespace so that it is
+ * usable for both C and C++ code.
+ */
+typedef uintptr_t MozRefCountType;
+
+/*
+ * This is the return type for AddRef() and Release() in nsISupports.
+ * IUnknown of COM returns an unsigned long from equivalent functions.
+ *
+ * The following ifdef exists to maintain binary compatibility with
+ * IUnknown, the base interface in Microsoft COM.
+ */
+#ifdef XP_WIN
+typedef unsigned long MozExternalRefCountType;
+#else
+typedef uint32_t MozExternalRefCountType;
+#endif
+
+#endif