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/src/contrib/boost/mpl/upper_bound.hpp

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C++ Header | 141 lines | 106 code | 23 blank | 12 comment | 0 complexity | 66e46ed77824a16764240c9f25a8a1a4 MD5 | raw file
  1
  2#ifndef BOOST_MPL_UPPER_BOUND_HPP_INCLUDED
  3#define BOOST_MPL_UPPER_BOUND_HPP_INCLUDED
  4
  5// Copyright Aleksey Gurtovoy 2001-2004
  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: upper_bound.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
 14// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
 15// $Revision: 49267 $
 16
 17#include <boost/mpl/less.hpp>
 18#include <boost/mpl/lambda.hpp>
 19#include <boost/mpl/aux_/na_spec.hpp>
 20#include <boost/mpl/aux_/config/workaround.hpp>
 21
 22#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610))
 23#   define BOOST_MPL_CFG_STRIPPED_DOWN_UPPER_BOUND_IMPL
 24#endif
 25
 26#if !defined(BOOST_MPL_CFG_STRIPPED_DOWN_UPPER_BOUND_IMPL)
 27#   include <boost/mpl/minus.hpp>
 28#   include <boost/mpl/divides.hpp>
 29#   include <boost/mpl/size.hpp>
 30#   include <boost/mpl/advance.hpp>
 31#   include <boost/mpl/begin_end.hpp>
 32#   include <boost/mpl/long.hpp>
 33#   include <boost/mpl/eval_if.hpp>
 34#   include <boost/mpl/prior.hpp>
 35#   include <boost/mpl/deref.hpp>
 36#   include <boost/mpl/apply.hpp>
 37#   include <boost/mpl/aux_/value_wknd.hpp>
 38#else
 39#   include <boost/mpl/find.hpp>
 40#   include <boost/mpl/bind.hpp>
 41#endif
 42
 43#include <boost/config.hpp>
 44
 45namespace boost { namespace mpl {
 46
 47#if defined(BOOST_MPL_CFG_STRIPPED_DOWN_UPPER_BOUND_IMPL)
 48
 49// agurt 23/oct/02: has a wrong complexity etc., but at least it works;
 50// feel free to contribute a better implementation!
 51template<
 52      typename BOOST_MPL_AUX_NA_PARAM(Sequence)
 53    , typename BOOST_MPL_AUX_NA_PARAM(T)
 54    , typename Predicate = less<>
 55    , typename pred_ = typename lambda<Predicate>::type
 56    >
 57struct upper_bound
 58    : find_if< Sequence, bind2<pred_,T,_> >
 59{
 60};
 61
 62#else
 63
 64namespace aux {
 65
 66template<
 67      typename Distance
 68    , typename Predicate
 69    , typename T
 70    , typename DeferredIterator
 71    >
 72struct upper_bound_step_impl;
 73
 74template< 
 75      typename Distance
 76    , typename Predicate
 77    , typename T
 78    , typename DeferredIterator
 79    >
 80struct upper_bound_step
 81{
 82    typedef typename eval_if<
 83          Distance
 84        , upper_bound_step_impl<Distance,Predicate,T,DeferredIterator>
 85        , DeferredIterator
 86        >::type type;
 87};
 88    
 89template<
 90      typename Distance
 91    , typename Predicate
 92    , typename T
 93    , typename DeferredIterator
 94    >
 95struct upper_bound_step_impl
 96{
 97    typedef typename divides< Distance, long_<2> >::type offset_;
 98    typedef typename DeferredIterator::type iter_;
 99    typedef typename advance< iter_,offset_ >::type middle_;
100    typedef typename apply2<
101              Predicate
102            , T
103            , typename deref<middle_>::type
104            >::type cond_;
105
106    typedef typename prior< minus< Distance, offset_ > >::type step_;
107    typedef upper_bound_step< offset_,Predicate,T,DeferredIterator > step_forward_;
108    typedef upper_bound_step< step_,Predicate,T,next<middle_> > step_backward_;
109    typedef typename eval_if<
110          cond_
111        , step_forward_
112        , step_backward_
113        >::type type;
114};
115
116} // namespace aux
117
118template<
119      typename BOOST_MPL_AUX_NA_PARAM(Sequence)
120    , typename BOOST_MPL_AUX_NA_PARAM(T)
121    , typename Predicate = less<>
122    >
123struct upper_bound
124{
125 private:
126    typedef typename lambda<Predicate>::type pred_;
127    typedef typename size<Sequence>::type size_;
128
129 public:
130    typedef typename aux::upper_bound_step<
131        size_,pred_,T,begin<Sequence>
132        >::type type;
133};
134
135#endif // BOOST_MPL_CFG_STRIPPED_DOWN_UPPER_BOUND_IMPL
136
137BOOST_MPL_AUX_NA_SPEC(2, upper_bound)
138
139}}
140
141#endif // BOOST_MPL_UPPER_BOUND_HPP_INCLUDED