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_REMOVE_IF_HPP
12 #define BOOST_COMPUTE_ALGORITHM_REMOVE_IF_HPP
13
14 #include <boost/static_assert.hpp>
15
16 #include <boost/compute/system.hpp>
17 #include <boost/compute/algorithm/copy_if.hpp>
18 #include <boost/compute/container/vector.hpp>
19 #include <boost/compute/functional/logical.hpp>
20 #include <boost/compute/type_traits/is_device_iterator.hpp>
21
22 namespace boost {
23 namespace compute {
24
25 /// Removes each element for which \p predicate returns \c true in the
26 /// range [\p first, \p last).
27 ///
28 /// Space complexity: \Omega(3n)
29 ///
30 /// \see remove()
31 template<class Iterator, class Predicate>
remove_if(Iterator first,Iterator last,Predicate predicate,command_queue & queue=system::default_queue ())32 inline Iterator remove_if(Iterator first,
33 Iterator last,
34 Predicate predicate,
35 command_queue &queue = system::default_queue())
36 {
37 BOOST_STATIC_ASSERT(is_device_iterator<Iterator>::value);
38 typedef typename std::iterator_traits<Iterator>::value_type value_type;
39
40 // temporary storage for the input data
41 ::boost::compute::vector<value_type> tmp(first, last, queue);
42
43 return ::boost::compute::copy_if(tmp.begin(),
44 tmp.end(),
45 first,
46 not1(predicate),
47 queue);
48 }
49
50 } // end compute namespace
51 } // end boost namespace
52
53 #endif // BOOST_COMPUTE_ALGORITHM_REMOVE_IF_HPP
54