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60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
// boost utility/base_from_member.hpp header file --------------------------//
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// (C) Copyright Daryle Walker 2001. Permission to copy, use, modify, sell
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// and distribute this software is granted provided this copyright
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// notice appears in all copies. This software is provided "as is" without
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// express or implied warranty, and with no claim as to its suitability for
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// any purpose.
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// See http://www.boost.org for most recent version including documentation.
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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/utility_fwd.hpp> // required for parameter defaults
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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 >
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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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explicit base_from_member()
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: member()
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{}
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template< typename T1 >
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explicit base_from_member( T1 x1 )
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: member( x1 )
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{}
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template< typename T1, typename T2 >
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base_from_member( T1 x1, T2 x2 )
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: member( x1, x2 )
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{}
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template< typename T1, typename T2, typename T3 >
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base_from_member( T1 x1, T2 x2, T3 x3 )
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: member( x1, x2, x3 )
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{}
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}; // boost::base_from_member
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} // namespace boost
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#endif // BOOST_UTILITY_BASE_FROM_MEMBER_HPP
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