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gather.hpp

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00001 /*
00002     Copyright 2008 Adobe Systems Incorporated
00003     Distributed under the MIT License (see accompanying file LICENSE_1_0_0.txt
00004     or a copy at http://stlab.adobe.com/licenses.html)
00005 */
00006 
00007 /**************************************************************************************************/
00008 
00014 #ifndef ADOBE_ALGORITHM_GATHER_HPP
00015 #define ADOBE_ALGORITHM_GATHER_HPP
00016 
00017 #include <algorithm>                // for std::table_partition
00018 
00019 #include <boost/bind.hpp>           // for boost::bind 
00020 #include <boost/range/begin.hpp>    // for boost::begin(range)
00021 #include <boost/range/end.hpp>      // for boost::end(range)
00022 
00023 
00024 /**************************************************************************************************/
00064 /**************************************************************************************************/
00065 
00066 namespace adobe {
00067 
00068 /**************************************************************************************************/
00069 
00075 template <
00076     typename Iter,  // Iter models BidirectionalIterator
00077     typename Pred>  // Pred models UnaryPredicate
00078 std::pair<Iter,Iter> gather ( Iter first, Iter last, Iter pivot, Pred pred )
00079 {
00080 //  The first call partitions everything up to (but not including) the pivot element,
00081 //  while the second call partitions the rest of the sequence.
00082     return std::make_pair (
00083         std::stable_partition ( first, pivot, !boost::bind ( pred, _1 )),
00084         std::stable_partition ( pivot, last,   boost::bind ( pred, _1 ))  );
00085 }
00086 
00087 /**************************************************************************************************/
00088 
00094 template <
00095     typename BidirectionalRange,    //
00096     typename Pred>                  // Pred models UnaryPredicate
00097 std::pair<
00098     typename boost::range_iterator<BidirectionalRange>::type,
00099     typename boost::range_iterator<BidirectionalRange>::type> 
00100 gather ( 
00101     BidirectionalRange &range, 
00102     typename boost::range_iterator<BidirectionalRange>::type pivot, 
00103     Pred pred )
00104 {
00105     return adobe::gather ( boost::begin ( range ), pivot, boost::end ( range ), pred );
00106 }
00107 
00108 /**************************************************************************************************/
00109 
00110 }   // namespace adobe
00111 
00112 /**************************************************************************************************/
00113 
00114 #endif
00115

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