ceph/src/boost/boost/algorithm/cxx11/is_partitioned.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  is_partitioned.hpp
   9 /// \brief Tell if a sequence is partitioned
  10 /// \author Marshall Clow
  11
  12 #ifndef BOOST_ALGORITHM_IS_PARTITIONED_HPP
  13 #define BOOST_ALGORITHM_IS_PARTITIONED_HPP
  14
  15 #include <boost/config.hpp>
  16 #include <boost/range/begin.hpp>
  17 #include <boost/range/end.hpp>
  18
  19 namespace boost { namespace algorithm {
  20
  21 /// \fn is_partitioned ( InputIterator first, InputIterator last, UnaryPredicate p )
  22 /// \brief Tests to see if a sequence is partitioned according to a predicate.
  23 ///        In other words, all the items in the sequence that satisfy the predicate are at the beginning of the sequence.
  24 ///
  25 /// \param first    The start of the input sequence
  26 /// \param last     One past the end of the input sequence
  27 /// \param p        The predicate to test the values with
  28 /// \note           This function is part of the C++2011 standard library.
  29 template <typename InputIterator, typename UnaryPredicate>
  30 BOOST_CXX14_CONSTEXPR bool is_partitioned ( InputIterator first, InputIterator last, UnaryPredicate p )
  31 {
  32 //  Run through the part that satisfy the predicate
  33     for ( ; first != last; ++first )
  34         if ( !p (*first))
  35             break;
  36 //  Now the part that does not satisfy the predicate
  37     for ( ; first != last; ++first )
  38         if ( p (*first))
  39             return false;
  40     return true;
  41 }
  42
  43 /// \fn is_partitioned ( const Range &r, UnaryPredicate p )
  44 /// \brief Tests to see if a sequence is partitioned according to a predicate.
  45 ///        In other words, all the items in the sequence that satisfy the predicate are at the beginning of the sequence.
  46 ///
  47 /// \param r        The input range
  48 /// \param p        The predicate to test the values with
  49 ///
  50 template <typename Range, typename UnaryPredicate>
  51 BOOST_CXX14_CONSTEXPR bool is_partitioned ( const Range &r, UnaryPredicate p )
  52 {
  53     return boost::algorithm::is_partitioned (boost::begin(r), boost::end(r), p);
  54 }
  55
  56
  57 }}
  58
  59 #endif  // BOOST_ALGORITHM_IS_PARTITIONED_HPP