63 lines
1.2 KiB
C++
63 lines
1.2 KiB
C++
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// Copyright Aleksey Gurtovoy 2002-2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/inherit_linearly.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/list.hpp>
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#include <iostream>
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namespace mpl = boost::mpl;
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using namespace mpl::placeholders;
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template< typename Base, typename T >
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struct tuple_part
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: Base
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{
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typedef tuple_part type; // note the typedef
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typedef typename Base::index::next index;
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friend T& field(tuple_part& t, index) { return t.field_; }
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T field_;
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};
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struct empty_tuple
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{
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typedef mpl::int_<-1> index;
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};
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typedef mpl::inherit_linearly<
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mpl::list<int,char const*,bool>
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, tuple_part<_,_>
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, empty_tuple
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>::type my_tuple;
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int main()
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{
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my_tuple t;
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field(t, mpl::int_<0>()) = -1;
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field(t, mpl::int_<1>()) = "text";
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field(t, mpl::int_<2>()) = false;
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std::cout
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<< field(t, mpl::int_<0>()) << '\n'
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<< field(t, mpl::int_<1>()) << '\n'
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<< field(t, mpl::int_<2>()) << '\n'
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;
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return 0;
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}
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