Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/memutil/MEM_RefCounted.h

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+/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup intern_memutil
+ *
+ * Declaration of MEM_RefCounted class.
+ */
+
+#ifndef __MEM_REFCOUNTED_H__
+#define __MEM_REFCOUNTED_H__
+
+/**
+ * An object with reference counting.
+ * Base class for objects with reference counting.
+ * When a shared object is ceated, it has reference count == 1.
+ * If the reference count of a shared object reaches zero, the object self-destructs.
+ * The default destructor of this object has been made protected on purpose.
+ * This disables the creation of shared objects on the stack.
+ *
+ * \author  Maarten Gribnau
+ * \date    March 31, 2001
+ */
+class MEM_RefCounted {
+ public:
+  /**
+   * Constructs a shared object.
+   */
+  MEM_RefCounted() = default;
+
+  /**
+   * Returns the reference count of this object.
+   * \return the reference count.
+   */
+  inline virtual int getRef() const;
+
+  /**
+   * Increases the reference count of this object.
+   * \return the new reference count.
+   */
+  inline virtual int incRef();
+
+  /**
+   * Decreases the reference count of this object.
+   * If the reference count reaches zero, the object self-destructs.
+   * \return the new reference count.
+   */
+  inline virtual int decRef();
+
+ protected:
+  /**
+   * Destructs a shared object.
+   * The destructor is protected to force the use of incRef and decRef.
+   */
+  virtual ~MEM_RefCounted() = default;
+
+  /** The reference count. */
+  int m_refCount = 1;
+};
+
+inline int MEM_RefCounted::getRef() const
+{
+  return m_refCount;
+}
+
+inline int MEM_RefCounted::incRef()
+{
+  return ++m_refCount;
+}
+
+inline int MEM_RefCounted::decRef()
+{
+  m_refCount--;
+  if (m_refCount == 0) {
+    delete this;
+    return 0;
+  }
+  return m_refCount;
+}
+
+#endif  // __MEM_REFCOUNTED_H__