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116 lines
2.6 KiB
116 lines
2.6 KiB
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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: at.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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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(__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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