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diff --git a/boost/beast/_experimental/unit_test/detail/const_container.hpp b/boost/beast/_experimental/unit_test/detail/const_container.hpp
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+//
+// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// 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)
+//
+// Official repository: https://github.com/boostorg/beast
+//
+
+#ifndef BOOST_BEAST_UNIT_TEST_DETAIL_CONST_CONTAINER_HPP
+#define BOOST_BEAST_UNIT_TEST_DETAIL_CONST_CONTAINER_HPP
+
+namespace boost {
+namespace beast {
+namespace unit_test {
+namespace detail {
+
+/** Adapter to constrain a container interface.
+    The interface allows for limited read only operations. Derived classes
+    provide additional behavior.
+*/
+template<class Container>
+class const_container
+{
+private:
+    using cont_type = Container;
+
+    cont_type m_cont;
+
+protected:
+    cont_type& cont()
+    {
+        return m_cont;
+    }
+
+    cont_type const& cont() const
+    {
+        return m_cont;
+    }
+
+public:
+    using value_type = typename cont_type::value_type;
+    using size_type = typename cont_type::size_type;
+    using difference_type = typename cont_type::difference_type;
+    using iterator = typename cont_type::const_iterator;
+    using const_iterator = typename cont_type::const_iterator;
+
+    /** Returns `true` if the container is empty. */
+    bool
+    empty() const
+    {
+        return m_cont.empty();
+    }
+
+    /** Returns the number of items in the container. */
+    size_type
+    size() const
+    {
+        return m_cont.size();
+    }
+
+    /** Returns forward iterators for traversal. */
+    /** @{ */
+    const_iterator
+    begin() const
+    {
+        return m_cont.cbegin();
+    }
+
+    const_iterator
+    cbegin() const
+    {
+        return m_cont.cbegin();
+    }
+
+    const_iterator
+    end() const
+    {
+        return m_cont.cend();
+    }
+
+    const_iterator
+    cend() const
+    {
+        return m_cont.cend();
+    }
+    /** @} */
+};
+
+} // detail
+} // unit_test
+} // beast
+} // boost
+
+#endif