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diff --git a/c++/src/H5IdComponent.h b/c++/src/H5IdComponent.h
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+// C++ informative line for the emacs editor: -*- C++ -*-
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef __IdComponent_H
+#define __IdComponent_H
+
+namespace H5 {
+
+/*! \class IdComponent
+    \brief Class IdComponent provides wrappers of the C functions that
+     operate on an HDF5 identifier.
+
+    In most cases, the C library handles these operations and an application
+    rarely needs them.
+*/
+class H5_DLLCPP IdComponent {
+    public:
+
+        // Increment reference counter.
+        void incRefCount(const hid_t obj_id) const;
+        void incRefCount() const;
+
+        // Decrement reference counter.
+        void decRefCount(const hid_t obj_id) const;
+        void decRefCount() const;
+
+        // Get the reference counter to this identifier.
+        int getCounter(const hid_t obj_id) const;
+        int getCounter() const;
+
+        // Returns an HDF5 object type, given the object id.
+        static H5I_type_t getHDFObjType(const hid_t obj_id);
+
+        // Returns an HDF5 object type of this object.
+        H5I_type_t getHDFObjType() const;
+
+        // Returns the number of members in a type.
+        static hsize_t getNumMembers(H5I_type_t type);
+
+        // Checks if the given ID is valid.
+        static bool isValid(hid_t an_id);
+
+        // Determines if an type exists.
+        static bool typeExists(H5I_type_t type);
+
+        // Assignment operator.
+        IdComponent& operator=(const IdComponent& rhs);
+
+        // Sets the identifier of this object to a new value.
+        void setId(const hid_t new_id);
+
+        // *** Deprecation warning ***
+        // The following two constructors are no longer appropriate after the
+        // data member "id" had been moved to the sub-classes.
+        // The copy constructor is a noop and is removed in 1.8.15 and the
+        // other will be removed from 1.10 release, and then from 1.8 if its
+        // removal does not raise any problems in two 1.10 releases.
+
+        // Creates an object to hold an HDF5 identifier.
+        // IdComponent(const hid_t h5_id); - removed from 1.10.1
+
+#ifndef DOXYGEN_SHOULD_SKIP_THIS
+
+        // Copy constructor: makes copy of the original IdComponent object.
+        // IdComponent(const IdComponent& original); - removed from 1.8.15
+
+        // Gets the identifier of this object.
+        virtual hid_t getId () const = 0;
+
+        // Pure virtual function for there are various H5*close for the
+        // subclasses.
+        virtual void close() = 0;
+
+        // Makes and returns the string "<class-name>::<func_name>";
+        // <class-name> is returned by fromClass().
+        H5std_string inMemFunc(const char* func_name) const;
+
+        ///\brief Returns this class name.
+        virtual H5std_string fromClass() const { return("IdComponent");}
+
+#endif // DOXYGEN_SHOULD_SKIP_THIS
+
+        // Destructor
+        virtual ~IdComponent();
+
+#ifndef DOXYGEN_SHOULD_SKIP_THIS
+
+    protected:
+        // Default constructor.
+        IdComponent();
+
+        // Gets the name of the file, in which an HDF5 object belongs.
+        H5std_string p_get_file_name() const;
+
+        // Verifies that the given id is valid.
+        static bool p_valid_id(const hid_t obj_id);
+
+        // Sets the identifier of this object to a new value. - this one
+        // doesn't increment reference count
+        virtual void p_setId(const hid_t new_id) = 0;
+
+        // This flag is used to decide whether H5dont_atexit should be called
+        static bool H5dontAtexit_called;
+
+    private:
+        // This flag indicates whether H5Library::initH5cpp has been called
+        // to register various terminating functions with atexit()
+        static bool H5cppinit;
+
+#endif // DOXYGEN_SHOULD_SKIP_THIS
+
+}; // end class IdComponent
+} // namespace H5
+
+#endif // __IdComponent_H