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#ifndef BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED
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#define BOOST_MPL_VECTOR_AUX_AT_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/at_fwd.hpp>
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#include <boost/mpl/vector/aux_/tag.hpp>
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#include <boost/mpl/long.hpp>
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#include <boost/mpl/void.hpp>
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#include <boost/mpl/aux_/nttp_decl.hpp>
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#include <boost/mpl/aux_/type_wrapper.hpp>
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#include <boost/mpl/aux_/value_wknd.hpp>
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#include <boost/mpl/aux_/config/typeof.hpp>
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#include <boost/mpl/aux_/config/ctps.hpp>
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namespace boost { namespace mpl {
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#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
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template< typename Vector, long n_ >
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struct v_at_impl
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{
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typedef long_< (Vector::lower_bound_::value + n_) > index_;
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typedef __typeof__( Vector::item_(index_()) ) type;
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};
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template< typename Vector, long n_ >
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struct v_at
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: aux::wrapped_type< typename v_at_impl<Vector,n_>::type >
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{
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};
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template<>
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struct at_impl< aux::vector_tag >
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{
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template< typename Vector, typename N > struct apply
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: v_at<
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Vector
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, BOOST_MPL_AUX_VALUE_WKND(N)::value
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>
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{
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};
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};
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#else
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# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
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&& !defined(BOOST_MPL_CFG_NO_NONTYPE_TEMPLATE_PARTIAL_SPEC)
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template< typename Vector, BOOST_MPL_AUX_NTTP_DECL(long, n_) > struct v_at;
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template< BOOST_MPL_AUX_NTTP_DECL(long, n_) >
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struct at_impl< aux::vector_tag<n_> >
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{
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template< typename Vector, typename N > struct apply
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#if !defined(BOOST_BORLANDC)
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: v_at<
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Vector
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, BOOST_MPL_AUX_VALUE_WKND(N)::value
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>
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{
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#else
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{
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typedef typename v_at<
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Vector
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, BOOST_MPL_AUX_VALUE_WKND(N)::value
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>::type type;
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#endif
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};
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};
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# else
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namespace aux {
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template< BOOST_MPL_AUX_NTTP_DECL(long, n_) > struct v_at_impl
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{
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template< typename V > struct result_;
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};
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// to work around ETI, etc.
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template<> struct v_at_impl<-1>
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{
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template< typename V > struct result_
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{
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typedef void_ type;
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};
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};
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} // namespace aux
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template< typename T, BOOST_MPL_AUX_NTTP_DECL(long, n_) >
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struct v_at
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: aux::v_at_impl<n_>::template result_<T>
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{
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};
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# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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#endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
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}}
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#endif // BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED
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