add Chapter18

Chapter18/cib/libs/boost/mp11/detail/mp_value.hpp

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+#ifndef BOOST_MP11_DETAIL_MP_VALUE_HPP_INCLUDED
+#define BOOST_MP11_DETAIL_MP_VALUE_HPP_INCLUDED
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/mp11/detail/config.hpp>
+#include <type_traits>
+
+#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
+
+namespace boost
+{
+namespace mp11
+{
+
+template<auto A> using mp_value = std::integral_constant<decltype(A), A>;
+
+} // namespace mp11
+} // namespace boost
+
+#endif // #if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
+
+#endif // #ifndef BOOST_MP11_DETAIL_MP_VALUE_HPP_INCLUDED