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