144 lines
3.7 KiB
C++
144 lines
3.7 KiB
C++
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#ifndef BOOST_MPL_LOWER_BOUND_HPP_INCLUDED
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#define BOOST_MPL_LOWER_BOUND_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2001-2004
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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/less.hpp>
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#include <boost/mpl/lambda.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/config/workaround.hpp>
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#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610))
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# define BOOST_MPL_CFG_STRIPPED_DOWN_LOWER_BOUND_IMPL
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#endif
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#if !defined(BOOST_MPL_CFG_STRIPPED_DOWN_LOWER_BOUND_IMPL)
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# include <boost/mpl/minus.hpp>
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# include <boost/mpl/divides.hpp>
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# include <boost/mpl/size.hpp>
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# include <boost/mpl/advance.hpp>
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# include <boost/mpl/begin_end.hpp>
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# include <boost/mpl/long.hpp>
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# include <boost/mpl/eval_if.hpp>
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# include <boost/mpl/prior.hpp>
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# include <boost/mpl/deref.hpp>
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# include <boost/mpl/apply.hpp>
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# include <boost/mpl/aux_/value_wknd.hpp>
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#else
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# include <boost/mpl/not.hpp>
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# include <boost/mpl/find.hpp>
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# include <boost/mpl/bind.hpp>
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#endif
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#include <boost/config.hpp>
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namespace boost { namespace mpl {
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#if defined(BOOST_MPL_CFG_STRIPPED_DOWN_LOWER_BOUND_IMPL)
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// agurt 23/oct/02: has a wrong complexity etc., but at least it works
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// feel free to contribute a better implementation!
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template<
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typename BOOST_MPL_AUX_NA_PARAM(Sequence)
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, typename BOOST_MPL_AUX_NA_PARAM(T)
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, typename Predicate = less<>
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, typename pred_ = typename lambda<Predicate>::type
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>
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struct lower_bound
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: find_if< Sequence, bind1< not_<>, bind2<pred_,_,T> > >
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{
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};
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#else
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namespace aux {
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template<
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typename Distance
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, typename Predicate
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, typename T
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, typename DeferredIterator
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>
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struct lower_bound_step_impl;
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template<
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typename Distance
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, typename Predicate
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, typename T
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, typename DeferredIterator
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>
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struct lower_bound_step
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{
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typedef typename eval_if<
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Distance
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, lower_bound_step_impl<Distance,Predicate,T,DeferredIterator>
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, DeferredIterator
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>::type type;
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};
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template<
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typename Distance
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, typename Predicate
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, typename T
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, typename DeferredIterator
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>
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struct lower_bound_step_impl
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{
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typedef typename divides< Distance, long_<2> >::type offset_;
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typedef typename DeferredIterator::type iter_;
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typedef typename advance< iter_,offset_ >::type middle_;
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typedef typename apply2<
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Predicate
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, typename deref<middle_>::type
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, T
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>::type cond_;
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typedef typename prior< minus< Distance, offset_> >::type step_;
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typedef lower_bound_step< offset_,Predicate,T,DeferredIterator > step_forward_;
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typedef lower_bound_step< step_,Predicate,T,next<middle_> > step_backward_;
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typedef typename eval_if<
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cond_
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, step_backward_
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, step_forward_
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>::type type;
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};
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} // namespace aux
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template<
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typename BOOST_MPL_AUX_NA_PARAM(Sequence)
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, typename BOOST_MPL_AUX_NA_PARAM(T)
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, typename Predicate = less<>
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>
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struct lower_bound
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{
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private:
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typedef typename lambda<Predicate>::type pred_;
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typedef typename size<Sequence>::type size_;
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public:
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typedef typename aux::lower_bound_step<
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size_,pred_,T,begin<Sequence>
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>::type type;
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};
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#endif // BOOST_MPL_CFG_STRIPPED_DOWN_LOWER_BOUND_IMPL
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BOOST_MPL_AUX_NA_SPEC(2, lower_bound)
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}}
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#endif // BOOST_MPL_LOWER_BOUND_HPP_INCLUDED
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