diff --git a/private/unordered_map_base.h b/private/unordered_map_base.h
deleted file mode 100644
index bc9b4716..00000000
--- a/private/unordered_map_base.h
+++ /dev/null
@@ -1,170 +0,0 @@
-///\file
-
-/******************************************************************************
-The MIT License(MIT)
-
-Embedded Template Library.
-https://github.com/ETLCPP/etl
-http://www.etlcpp.com
-
-Copyright(c) 2014 jwellbelove
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files(the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions :
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-******************************************************************************/
-
-#ifndef __ETL_IN_IUNORDERED_MAP_H__
-#error This header is a private element of etl::unordered_map & etl::iunordered_map
-#endif
-
-#ifndef __ETL_UNORDERED_MAP_BASE__
-#define __ETL_UNORDERED_MAP_BASE__
-
-#include <stddef.h>
-#include "../exception.h"
-#include "../error_handler.h"
-
-#define ETL_FILE "16"
-
-namespace etl
-{
-  //***************************************************************************
-  /// Exception for the unordered_map.
-  ///\ingroup unordered_map
-  //***************************************************************************
-  class unordered_map_exception : public exception
-  {
-  public:
-
-    unordered_map_exception(string_type what, string_type file_name, numeric_type line_number)
-      : exception(what, file_name, line_number)
-    {
-    }
-  };
-
-  //***************************************************************************
-  /// Full exception for the unordered_map.
-  ///\ingroup unordered_map
-  //***************************************************************************
-  class unordered_map_full : public unordered_map_exception
-  {
-  public:
-
-    unordered_map_full(string_type file_name, numeric_type line_number)
-      : unordered_map_exception(ETL_ERROR_TEXT("unordered_map:full", ETL_FILE"A"), file_name, line_number)
-    {
-    }
-  };
-
-  //***************************************************************************
-  /// Out of range exception for the unordered_map.
-  ///\ingroup unordered_map
-  //***************************************************************************
-  class unordered_map_out_of_range : public unordered_map_exception
-  {
-  public:
-
-    unordered_map_out_of_range(string_type file_name, numeric_type line_number)
-      : unordered_map_exception(ETL_ERROR_TEXT("unordered_map:range", ETL_FILE"B"), file_name, line_number)
-    {}
-  };
-
-  //***************************************************************************
-  /// Iterator exception for the unordered_map.
-  ///\ingroup unordered_map
-  //***************************************************************************
-  class unordered_map_iterator : public unordered_map_exception
-  {
-  public:
-
-    unordered_map_iterator(string_type file_name, numeric_type line_number)
-      : unordered_map_exception("unordered_map:iterator", file_name, line_number)
-    {
-    }
-  };
-
-  //***************************************************************************
-  /// The base class for all unordered_maps.
-  ///\ingroup unordered_map
-  //***************************************************************************
-  class unordered_map_base
-  {
-  public:
-
-    typedef size_t size_type; ///< The type used for determining the size of unordered_map.
-
-    //*************************************************************************
-    /// Gets the size of the unordered_map.
-    //*************************************************************************
-    size_type size() const
-    {
-      return current_size;
-    }
-
-    //*************************************************************************
-    /// Gets the maximum possible size of the unordered_map.
-    //*************************************************************************
-    size_type max_size() const
-    {
-      return MAX_SIZE;
-    }
-
-    //*************************************************************************
-    /// Checks to see if the unordered_map is empty.
-    //*************************************************************************
-    bool empty() const
-    {
-      return current_size == 0;
-    }
-
-    //*************************************************************************
-    /// Checks to see if the unordered_map is full.
-    //*************************************************************************
-    bool full() const
-    {
-      return current_size == MAX_SIZE;
-    }
-
-    //*************************************************************************
-    /// Returns the remaining capacity.
-    ///\return The remaining capacity.
-    //*************************************************************************
-    size_t available() const
-    {
-      return max_size() - size();
-    }
-
-  protected:
-
-    //*************************************************************************
-    /// The constructor that is called from derived classes.
-    //*************************************************************************
-    unordered_map_base(size_type max_size)
-      : current_size(0),
-        MAX_SIZE(max_size)
-    {
-    }
-
-    size_type current_size;   ///< The number of the used nodes.
-    const size_type MAX_SIZE; ///< The maximum size of the unordered_map.
-  };
-}
-
-#undef ETL_FILE
-
-#endif