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diff --git a/boost/poly_collection/base_collection.hpp b/boost/poly_collection/base_collection.hpp
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+/* Copyright 2016-2017 Joaquin M Lopez Munoz.
+ * 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/poly_collection for library home page.
+ */
+
+#ifndef BOOST_POLY_COLLECTION_BASE_COLLECTION_HPP
+#define BOOST_POLY_COLLECTION_BASE_COLLECTION_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/poly_collection/base_collection_fwd.hpp>
+#include <boost/poly_collection/detail/base_model.hpp>
+#include <boost/poly_collection/detail/poly_collection.hpp>
+#include <utility>
+
+namespace boost{
+
+namespace poly_collection{
+
+template<typename Base,typename Allocator>
+class base_collection:
+ public detail::poly_collection_impl::poly_collection<
+   detail::base_model<Base>,Allocator>
+{
+  using base_type=detail::poly_collection_impl::poly_collection<
+    detail::base_model<Base>,Allocator>;
+
+  base_type&       base()noexcept{return *this;}
+  const base_type& base()const noexcept{return *this;}
+
+public:
+  using base_type::base_type;
+
+  base_collection()=default;
+  base_collection(const base_collection& x)=default;
+  base_collection(base_collection&& x)=default;
+  base_collection& operator=(const base_collection& x)=default;
+  base_collection& operator=(base_collection&& x)=default;
+   
+  template<typename B,typename A>
+  friend bool operator==(
+    const base_collection<B,A>&,const base_collection<B,A>&);
+};
+
+template<typename Base,typename Allocator>
+bool operator==(
+  const base_collection<Base,Allocator>& x,
+  const base_collection<Base,Allocator>& y)
+{
+  return x.base()==y.base();
+}
+
+template<typename Base,typename Allocator>
+bool operator!=(
+  const base_collection<Base,Allocator>& x,
+  const base_collection<Base,Allocator>& y)
+{
+ return !(x==y);
+}
+
+template<typename Base,typename Allocator>
+void swap(
+  base_collection<Base,Allocator>& x,base_collection<Base,Allocator>& y)
+{
+  x.swap(y);
+}
+
+} /* namespace  */
+
+using poly_collection::base_collection;
+
+} /* namespace boost */
+
+#endif