compute/algorithm/find.hpp

0001 //---------------------------------------------------------------------------//
0002 // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
0003 //
0004 // Distributed under the Boost Software License, Version 1.0
0005 // See accompanying file LICENSE_1_0.txt or copy at
0006 // http://www.boost.org/LICENSE_1_0.txt
0007 //
0008 // See http://boostorg.github.com/compute for more information.
0009 //---------------------------------------------------------------------------//
0010
0011 #ifndef BOOST_COMPUTE_ALGORITHM_FIND_HPP
0012 #define BOOST_COMPUTE_ALGORITHM_FIND_HPP
0013
0014 #include <boost/static_assert.hpp>
0015
0016 #include <boost/compute/lambda.hpp>
0017 #include <boost/compute/system.hpp>
0018 #include <boost/compute/command_queue.hpp>
0019 #include <boost/compute/algorithm/find_if.hpp>
0020 #include <boost/compute/type_traits/vector_size.hpp>
0021 #include <boost/compute/type_traits/is_device_iterator.hpp>
0022
0023 namespace boost {
0024 namespace compute {
0025
0026 /// Returns an iterator pointing to the first element in the range
0027 /// [\p first, \p last) that equals \p value.
0028 ///
0029 /// Space complexity: \Omega(1)
0030 template<class InputIterator, class T>
0031 inline InputIterator find(InputIterator first,
0032                           InputIterator last,
0033                           const T &value,
0034                           command_queue &queue = system::default_queue())
0035 {
0036     BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);
0037     typedef typename std::iterator_traits<InputIterator>::value_type value_type;
0038
0039     using ::boost::compute::_1;
0040     using ::boost::compute::lambda::all;
0041
0042     if(vector_size<value_type>::value == 1){
0043         return ::boost::compute::find_if(
0044                    first,
0045                    last,
0046                    _1 == value,
0047                    queue
0048                );
0049     }
0050     else {
0051         return ::boost::compute::find_if(
0052                    first,
0053                    last,
0054                    all(_1 == value),
0055                    queue
0056                );
0057     }
0058 }
0059
0060 } // end compute namespace
0061 } // end boost namespace
0062
0063 #endif // BOOST_COMPUTE_ALGORITHM_FIND_HPP