ceph/src/boost/boost/algorithm/cxx11/partition_copy.hpp

   1 /*
   2    Copyright (c) Marshall Clow 2011-2012.
   3
   4    Distributed under the Boost Software License, Version 1.0. (See accompanying
   5    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 */
   7
   8 /// \file  partition_copy.hpp
   9 /// \brief Copy a subset of a sequence to a new sequence
  10 /// \author Marshall Clow
  11
  12 #ifndef BOOST_ALGORITHM_PARTITION_COPY_HPP
  13 #define BOOST_ALGORITHM_PARTITION_COPY_HPP
  14
  15 #include <utility>  // for std::pair
  16
  17 #include <boost/config.hpp>
  18 #include <boost/range/begin.hpp>
  19 #include <boost/range/end.hpp>
  20
  21 namespace boost { namespace algorithm {
  22
  23 /// \fn partition_copy ( InputIterator first, InputIterator last,
  24 ///     OutputIterator1 out_true, OutputIterator2 out_false, UnaryPredicate p )
  25 /// \brief Copies the elements that satisfy the predicate p from the range [first, last)
  26 ///     to the range beginning at d_first_true, and
  27 ///     copies the elements that do not satisfy p to the range beginning at d_first_false.
  28 ///
  29 ///
  30 /// \param first     The start of the input sequence
  31 /// \param last      One past the end of the input sequence
  32 /// \param out_true  An output iterator to write the elements that satisfy the predicate into
  33 /// \param out_false An output iterator to write the elements that do not satisfy the predicate into
  34 /// \param p         A predicate for dividing the elements of the input sequence.
  35 ///
  36 /// \note            This function is part of the C++2011 standard library.
  37 template <typename InputIterator,
  38         typename OutputIterator1, typename OutputIterator2, typename UnaryPredicate>
  39 BOOST_CXX14_CONSTEXPR std::pair<OutputIterator1, OutputIterator2>
  40 partition_copy ( InputIterator first, InputIterator last,
  41         OutputIterator1 out_true, OutputIterator2 out_false, UnaryPredicate p )
  42 {
  43     for ( ; first != last; ++first )
  44         if ( p (*first))
  45             *out_true++ = *first;
  46         else
  47             *out_false++ = *first;
  48     return std::pair<OutputIterator1, OutputIterator2> ( out_true, out_false );
  49 }
  50
  51 /// \fn partition_copy ( const Range &r,
  52 ///     OutputIterator1 out_true, OutputIterator2 out_false, UnaryPredicate p )
  53 ///
  54 /// \param r         The input range
  55 /// \param out_true  An output iterator to write the elements that satisfy the predicate into
  56 /// \param out_false An output iterator to write the elements that do not satisfy the predicate into
  57 /// \param p         A predicate for dividing the elements of the input sequence.
  58 ///
  59 template <typename Range, typename OutputIterator1, typename OutputIterator2,
  60             typename UnaryPredicate>
  61 BOOST_CXX14_CONSTEXPR std::pair<OutputIterator1, OutputIterator2>
  62 partition_copy ( const Range &r, OutputIterator1 out_true, OutputIterator2 out_false,
  63                                 UnaryPredicate p )
  64 {
  65     return boost::algorithm::partition_copy
  66                       (boost::begin(r), boost::end(r), out_true, out_false, p );
  67 }
  68
  69 }} // namespace boost and algorithm
  70
  71 #endif  // BOOST_ALGORITHM_PARTITION_COPY_HPP