// boost utility/base_from_member.hpp header file --------------------------//
-// (C) Copyright Daryle Walker 2001. Permission to copy, use, modify, sell
-// and distribute this software is granted provided this copyright
-// notice appears in all copies. This software is provided "as is" without
-// express or implied warranty, and with no claim as to its suitability for
-// any purpose.
+// 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 for most recent version including documentation.
+// 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/utility_fwd.hpp> // required for parameter defaults
+#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
// Contributed by Daryle Walker
-template < typename MemberType, int UniqueID >
+template < typename MemberType, int UniqueID = 0 >
class base_from_member
{
protected:
MemberType member;
- explicit base_from_member()
+ base_from_member()
: member()
{}
- template< typename T1 >
- explicit base_from_member( T1 x1 )
- : member( x1 )
- {}
-
- template< typename T1, typename T2 >
- base_from_member( T1 x1, T2 x2 )
- : member( x1, x2 )
- {}
-
- template< typename T1, typename T2, typename T3 >
- base_from_member( T1 x1, T2 x2, T3 x3 )
- : member( x1, x2, x3 )
- {}
+ 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
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