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+// boost utility/base_from_member.hpp header file --------------------------//
+
+// Copyright 2001, 2003, 2004 Daryle Walker. Use, modification, and
+// distribution are subject to the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or a copy at
+// <http://www.boost.org/LICENSE_1_0.txt>.)
+
+// See <http://www.boost.org/libs/utility/> for the library's home page.
+
+#ifndef BOOST_UTILITY_BASE_FROM_MEMBER_HPP
+#define BOOST_UTILITY_BASE_FROM_MEMBER_HPP
+
+#include <boost/preprocessor/arithmetic/inc.hpp>
+#include <boost/preprocessor/repetition/enum_binary_params.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/repeat_from_to.hpp>
+
+
+// Base-from-member arity configuration macro ------------------------------//
+
+// The following macro determines how many arguments will be in the largest
+// constructor template of base_from_member. Constructor templates will be
+// generated from one argument to this maximum. Code from other files can read
+// this number if they need to always match the exact maximum base_from_member
+// uses. The maximum constructor length can be changed by overriding the
+// #defined constant. Make sure to apply the override, if any, for all source
+// files during project compiling for consistency.
+
+// Contributed by Jonathan Turkanis
+
+#ifndef BOOST_BASE_FROM_MEMBER_MAX_ARITY
+#define BOOST_BASE_FROM_MEMBER_MAX_ARITY 10
+#endif
+
+
+// An iteration of a constructor template for base_from_member -------------//
+
+// A macro that should expand to:
+// template < typename T1, ..., typename Tn >
+// base_from_member( T1 x1, ..., Tn xn )
+// : member( x1, ..., xn )
+// {}
+// This macro should only persist within this file.
+
+#define BOOST_PRIVATE_CTR_DEF( z, n, data ) \
+ template < BOOST_PP_ENUM_PARAMS(n, typename T) > \
+ explicit base_from_member( BOOST_PP_ENUM_BINARY_PARAMS(n, T, x) ) \
+ : member( BOOST_PP_ENUM_PARAMS(n, x) ) \
+ {} \
+ /**/
+
+
+namespace boost
+{
+
+// Base-from-member class template -----------------------------------------//
+
+// Helper to initialize a base object so a derived class can use this
+// object in the initialization of another base class. Used by
+// Dietmar Kuehl from ideas by Ron Klatcho to solve the problem of a
+// base class needing to be initialized by a member.
+
+// Contributed by Daryle Walker
+
+template < typename MemberType, int UniqueID = 0 >
+class base_from_member
+{
+protected:
+ MemberType member;
+
+ base_from_member()
+ : member()
+ {}
+
+ BOOST_PP_REPEAT_FROM_TO( 1, BOOST_PP_INC(BOOST_BASE_FROM_MEMBER_MAX_ARITY),
+ BOOST_PRIVATE_CTR_DEF, _ )
+
+}; // boost::base_from_member
+
+} // namespace boost
+
+
+// Undo any private macros
+#undef BOOST_PRIVATE_CTR_DEF
+
+
+#endif // BOOST_UTILITY_BASE_FROM_MEMBER_HPP