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|---|---|---|
| 7c673cae FG |
1 | |
| 2 | #ifndef BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED | |
| 3 | #define BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED | |
| 4 | ||
| 5 | // Copyright Aleksey Gurtovoy 2000-2004 | |
| 6 | // | |
| 7 | // Distributed under the Boost Software License, Version 1.0. | |
| 8 | // (See accompanying file LICENSE_1_0.txt or copy at | |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 10 | // | |
| 11 | // See http://www.boost.org/libs/mpl for documentation. | |
| 12 | ||
| 13 | // $Id$ | |
| 14 | // $Date$ | |
| 15 | // $Revision$ | |
| 16 | ||
| 17 | #include <boost/mpl/at_fwd.hpp> | |
| 18 | #include <boost/mpl/vector/aux_/tag.hpp> | |
| 19 | #include <boost/mpl/long.hpp> | |
| 20 | #include <boost/mpl/void.hpp> | |
| 21 | #include <boost/mpl/aux_/nttp_decl.hpp> | |
| 22 | #include <boost/mpl/aux_/type_wrapper.hpp> | |
| 23 | #include <boost/mpl/aux_/value_wknd.hpp> | |
| 24 | #include <boost/mpl/aux_/config/typeof.hpp> | |
| 25 | #include <boost/mpl/aux_/config/ctps.hpp> | |
| 26 | ||
| 27 | namespace boost { namespace mpl { | |
| 28 | ||
| 29 | #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES) | |
| 30 | ||
| 31 | template< typename Vector, long n_ > | |
| 32 | struct v_at_impl | |
| 33 | { | |
| 34 | typedef long_< (Vector::lower_bound_::value + n_) > index_; | |
| 35 | typedef __typeof__( Vector::item_(index_()) ) type; | |
| 36 | }; | |
| 37 | ||
| 38 | ||
| 39 | template< typename Vector, long n_ > | |
| 40 | struct v_at | |
| 41 | : aux::wrapped_type< typename v_at_impl<Vector,n_>::type > | |
| 42 | { | |
| 43 | }; | |
| 44 | ||
| 45 | template<> | |
| 46 | struct at_impl< aux::vector_tag > | |
| 47 | { | |
| 48 | template< typename Vector, typename N > struct apply | |
| 49 | : v_at< | |
| 50 | Vector | |
| 51 | , BOOST_MPL_AUX_VALUE_WKND(N)::value | |
| 52 | > | |
| 53 | { | |
| 54 | }; | |
| 55 | }; | |
| 56 | ||
| 57 | #else | |
| 58 | ||
| 59 | # if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ | |
| 60 | && !defined(BOOST_MPL_CFG_NO_NONTYPE_TEMPLATE_PARTIAL_SPEC) | |
| 61 | ||
| 62 | template< typename Vector, BOOST_MPL_AUX_NTTP_DECL(long, n_) > struct v_at; | |
| 63 | ||
| 64 | template< BOOST_MPL_AUX_NTTP_DECL(long, n_) > | |
| 65 | struct at_impl< aux::vector_tag<n_> > | |
| 66 | { | |
| 67 | template< typename Vector, typename N > struct apply | |
| 68 | #if !defined(__BORLANDC__) | |
| 69 | : v_at< | |
| 70 | Vector | |
| 71 | , BOOST_MPL_AUX_VALUE_WKND(N)::value | |
| 72 | > | |
| 73 | { | |
| 74 | #else | |
| 75 | { | |
| 76 | typedef typename v_at< | |
| 77 | Vector | |
| 78 | , BOOST_MPL_AUX_VALUE_WKND(N)::value | |
| 79 | >::type type; | |
| 80 | #endif | |
| 81 | }; | |
| 82 | }; | |
| 83 | ||
| 84 | # else | |
| 85 | ||
| 86 | namespace aux { | |
| 87 | ||
| 88 | template< BOOST_MPL_AUX_NTTP_DECL(long, n_) > struct v_at_impl | |
| 89 | { | |
| 90 | template< typename V > struct result_; | |
| 91 | }; | |
| 92 | ||
| 93 | // to work around ETI, etc. | |
| 94 | template<> struct v_at_impl<-1> | |
| 95 | { | |
| 96 | template< typename V > struct result_ | |
| 97 | { | |
| 98 | typedef void_ type; | |
| 99 | }; | |
| 100 | }; | |
| 101 | ||
| 102 | } // namespace aux | |
| 103 | ||
| 104 | template< typename T, BOOST_MPL_AUX_NTTP_DECL(long, n_) > | |
| 105 | struct v_at | |
| 106 | : aux::v_at_impl<n_>::template result_<T> | |
| 107 | { | |
| 108 | }; | |
| 109 | ||
| 110 | # endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION | |
| 111 | ||
| 112 | #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES | |
| 113 | ||
| 114 | }} | |
| 115 | ||
| 116 | #endif // BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED |