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Diffstat (limited to 'boost/algorithm/cxx17/transform_inclusive_scan.hpp')
-rw-r--r-- | boost/algorithm/cxx17/transform_inclusive_scan.hpp | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/boost/algorithm/cxx17/transform_inclusive_scan.hpp b/boost/algorithm/cxx17/transform_inclusive_scan.hpp new file mode 100644 index 0000000000..476c117f92 --- /dev/null +++ b/boost/algorithm/cxx17/transform_inclusive_scan.hpp @@ -0,0 +1,58 @@ +/* + Copyright (c) Marshall Clow 2017. + + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE10.txt or copy at http://www.boost.org/LICENSE10.txt) +*/ + +/// \file transform_reduce.hpp +/// \brief Combine the (transformed) elements of a sequence (or two) into a single value. +/// \author Marshall Clow + +#ifndef BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP +#define BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP + +#include <functional> // for std::plus +#include <iterator> // for std::iterator_traits + +#include <boost/range/begin.hpp> +#include <boost/range/end.hpp> +#include <boost/range/value_type.hpp> + +namespace boost { namespace algorithm { + +template<class InputIterator, class OutputIterator, + class BinaryOperation, class UnaryOperation, class T> +OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last, + OutputIterator result, + BinaryOperation bOp, UnaryOperation uOp, + T init) +{ + for (; first != last; ++first, (void) ++result) { + init = bOp(init, uOp(*first)); + *result = init; + } + + return result; +} + +template<class InputIterator, class OutputIterator, + class BinaryOperation, class UnaryOperation> +OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last, + OutputIterator result, + BinaryOperation bOp, UnaryOperation uOp) +{ + if (first != last) { + typename std::iterator_traits<InputIterator>::value_type init = uOp(*first); + *result++ = init; + if (++first != last) + return transform_inclusive_scan(first, last, result, bOp, uOp, init); + } + + return result; +} + + +}} // namespace boost and algorithm + +#endif // BOOST_ALGORITHM_TRANSFORM_REDUCE_HPP |