1 /*
2    Copyright (c) Marshall Clow 2017.
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  exclusive_scan.hpp
9 /// \brief ???
10 /// \author Marshall Clow
11 
12 #ifndef BOOST_ALGORITHM_EXCLUSIVE_SCAN_HPP
13 #define BOOST_ALGORITHM_EXCLUSIVE_SCAN_HPP
14 
15 #include <functional>     // for std::plus
16 #include <iterator>       // for std::iterator_traits
17 
18 #include <boost/config.hpp>
19 #include <boost/range/begin.hpp>
20 #include <boost/range/end.hpp>
21 #include <boost/range/value_type.hpp>
22 
23 namespace boost { namespace algorithm {
24 
25 template<class InputIterator, class OutputIterator, class T, class BinaryOperation>
26 OutputIterator exclusive_scan(InputIterator first, InputIterator last,
27                               OutputIterator result, T init, BinaryOperation bOp)
28 {
29     if (first != last)
30     {
31         T saved = init;
mismatch(InputIterator1 first1,InputIterator1 last1,InputIterator2 first2,InputIterator2 last2,BinaryPredicate pred)32         do
33         {
34             init = bOp(init, *first);
35             *result = saved;
36             saved = init;
37             ++result;
38         } while (++first != last);
39     }
40     return result;
41 }
42 
43 template<class InputIterator, class OutputIterator, class T>
44 OutputIterator exclusive_scan(InputIterator first, InputIterator last,
45                               OutputIterator result, T init)
46 {
47 	typedef typename std::iterator_traits<InputIterator>::value_type VT;
48     return boost::algorithm::exclusive_scan(first, last, result, init, std::plus<VT>());
49 }
50 
51 }} // namespace boost and algorithm
mismatch(InputIterator1 first1,InputIterator1 last1,InputIterator2 first2,InputIterator2 last2)52 
53 #endif // BOOST_ALGORITHM_EXCLUSIVE_SCAN_HPP
54