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diff --git a/boost/intrusive/detail/size_holder.hpp b/boost/intrusive/detail/size_holder.hpp
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+++ b/boost/intrusive/detail/size_holder.hpp
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+/////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga  2014-2014
+//
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/intrusive for documentation.
+//
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTRUSIVE_DETAIL_SIZE_HOLDER_HPP
+#define BOOST_INTRUSIVE_DETAIL_SIZE_HOLDER_HPP
+
+#if defined(_MSC_VER)
+#  pragma once
+#endif
+
+namespace boost {
+namespace intrusive {
+namespace detail {
+
+template<bool ConstantSize, class SizeType, class Tag = void>
+struct size_holder
+{
+   static const bool constant_time_size = ConstantSize;
+   typedef SizeType  size_type;
+
+   SizeType get_size() const
+   {  return size_;  }
+
+   void set_size(SizeType size)
+   {  size_ = size; }
+
+   void decrement()
+   {  --size_; }
+
+   void increment()
+   {  ++size_; }
+
+   void increase(SizeType n)
+   {  size_ += n; }
+
+   void decrease(SizeType n)
+   {  size_ -= n; }
+
+   SizeType size_;
+};
+
+template<class SizeType, class Tag>
+struct size_holder<false, SizeType, Tag>
+{
+   static const bool constant_time_size = false;
+   typedef SizeType  size_type;
+
+   size_type get_size() const
+   {  return 0;  }
+
+   void set_size(size_type)
+   {}
+
+   void decrement()
+   {}
+
+   void increment()
+   {}
+
+   void increase(SizeType)
+   {}
+
+   void decrease(SizeType)
+   {}
+};
+
+}  //namespace detail{
+}  //namespace intrusive{
+}  //namespace boost{
+
+#endif //BOOST_INTRUSIVE_DETAIL_SIZE_HOLDER_HPP