ceph/src/boost/boost/compute/algorithm/find.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_FIND_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_FIND_HPP
  13
  14 #include <boost/compute/lambda.hpp>
  15 #include <boost/compute/system.hpp>
  16 #include <boost/compute/command_queue.hpp>
  17 #include <boost/compute/algorithm/find_if.hpp>
  18 #include <boost/compute/type_traits/vector_size.hpp>
  19
  20 namespace boost {
  21 namespace compute {
  22
  23 /// Returns an iterator pointing to the first element in the range
  24 /// [\p first, \p last) that equals \p value.
  25 ///
  26 /// Space complexity: \Omega(1)
  27 template<class InputIterator, class T>
  28 inline InputIterator find(InputIterator first,
  29                           InputIterator last,
  30                           const T &value,
  31                           command_queue &queue = system::default_queue())
  32 {
  33     typedef typename std::iterator_traits<InputIterator>::value_type value_type;
  34
  35     using ::boost::compute::_1;
  36     using ::boost::compute::lambda::all;
  37
  38     if(vector_size<value_type>::value == 1){
  39         return ::boost::compute::find_if(
  40                    first,
  41                    last,
  42                    _1 == value,
  43                    queue
  44                );
  45     }
  46     else {
  47         return ::boost::compute::find_if(
  48                    first,
  49                    last,
  50                    all(_1 == value),
  51                    queue
  52                );
  53     }
  54 }
  55
  56 } // end compute namespace
  57 } // end boost namespace
  58
  59 #endif // BOOST_COMPUTE_ALGORITHM_FIND_HPP