1// -*- C++ -*-
 2//===----------------------------------------------------------------------===//
 3//
 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 5// See https://llvm.org/LICENSE.txt for license information.
 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 7//
 8//===----------------------------------------------------------------------===//
 9
10#ifndef _LIBCPP___NUMERIC_TRANSFORM_INCLUSIVE_SCAN_H
11#define _LIBCPP___NUMERIC_TRANSFORM_INCLUSIVE_SCAN_H
12
13#include <__config>
14#include <__iterator/iterator_traits.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17#  pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22#if _LIBCPP_STD_VER >= 17
23
24template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
25_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator transform_inclusive_scan(
26    _InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b, _UnaryOp __u, _Tp __init) {
27  for (; __first != __last; ++__first, (void)++__result) {
28    __init    = __b(__init, __u(*__first));
29    *__result = __init;
30  }
31
32  return __result;
33}
34
35template <class _InputIterator, class _OutputIterator, class _BinaryOp, class _UnaryOp>
36_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator transform_inclusive_scan(
37    _InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b, _UnaryOp __u) {
38  if (__first != __last) {
39    typename iterator_traits<_InputIterator>::value_type __init = __u(*__first);
40    *__result++                                                 = __init;
41    if (++__first != __last)
42      return std::transform_inclusive_scan(__first, __last, __result, __b, __u, __init);
43  }
44
45  return __result;
46}
47
48#endif // _LIBCPP_STD_VER >= 17
49
50_LIBCPP_END_NAMESPACE_STD
51
52#endif // _LIBCPP___NUMERIC_TRANSFORM_INCLUSIVE_SCAN_H