Prevent accidentally copy/move of refcounted objects

irr/include/IReferenceCounted.h

@@ -51,6 +51,10 @@ public:
 	{
 	}
 
+	// Reference counted objects can be neither copied nor moved.
+	IReferenceCounted(const IReferenceCounted &) = delete;
+	IReferenceCounted &operator=(const IReferenceCounted &) = delete;
+
 	//! Grabs the object. Increments the reference counter by one.
 	/** Someone who calls grab() to an object, should later also
 	call drop() to it. If an object never gets as much drop() as

src/util/pointer.h

@@ -273,9 +273,7 @@ public:
 	void grab() noexcept { ++m_refcount; }
 	void drop() noexcept { if (--m_refcount == 0) delete this; }
 
-	// Preserve own reference count.
+	DISABLE_CLASS_COPY(IntrusiveReferenceCounted)
-	IntrusiveReferenceCounted(const IntrusiveReferenceCounted &) {}
-	IntrusiveReferenceCounted &operator=(const IntrusiveReferenceCounted &) { return *this; }
 private:
 	u32 m_refcount = 1;
 };