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46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
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#ifndef BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
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#define BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2000-2004
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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/begin_end.hpp>
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#include <boost/mpl/advance.hpp>
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#include <boost/mpl/deref.hpp>
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#include <boost/mpl/aux_/traits_lambda_spec.hpp>
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namespace boost { namespace mpl {
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// default implementation; conrete sequences might override it by
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// specializing either the 'at_impl' or the primary 'at' template
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template< typename Tag >
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struct at_impl
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{
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template< typename Sequence, typename N > struct apply
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{
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typedef typename advance<
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typename begin<Sequence>::type
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, N
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>::type iter_;
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typedef typename deref<iter_>::type type;
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};
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};
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BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, at_impl)
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}}
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#endif // BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
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