ceph/src/boost/boost/compute/algorithm/binary_search.hpp

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 // See http://boostorg.github.com/compute for more information.
   9 //---------------------------------------------------------------------------//
  10
  11 #ifndef BOOST_COMPUTE_ALGORITHM_BINARY_SEARCH_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_BINARY_SEARCH_HPP
  13
  14 #include <boost/compute/system.hpp>
  15 #include <boost/compute/command_queue.hpp>
  16 #include <boost/compute/algorithm/lower_bound.hpp>
  17
  18 namespace boost {
  19 namespace compute {
  20
  21 /// Returns \c true if \p value is in the sorted range [\p first,
  22 /// \p last).
  23 ///
  24 /// Space complexity: \Omega(1)
  25 template<class InputIterator, class T>
  26 inline bool binary_search(InputIterator first,
  27                           InputIterator last,
  28                           const T &value,
  29                           command_queue &queue = system::default_queue())
  30 {
  31     InputIterator position = lower_bound(first, last, value, queue);
  32
  33     return position != last && position.read(queue) == value;
  34 }
  35
  36 } // end compute namespace
  37 } // end boost namespace
  38
  39 #endif // BOOST_COMPUTE_ALGORITHM_BINARY_SEARCH_HPP