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_EXCLUSIVE_SCAN_H
11#define _LIBCPP___NUMERIC_TRANSFORM_EXCLUSIVE_SCAN_H
12
13#include <__config>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16#  pragma GCC system_header
17#endif
18
19_LIBCPP_BEGIN_NAMESPACE_STD
20
21#if _LIBCPP_STD_VER >= 17
22
23template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
24_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator transform_exclusive_scan(
25    _InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b, _UnaryOp __u) {
26  if (__first != __last) {
27    _Tp __saved = __init;
28    do {
29      __init    = __b(__init, __u(*__first));
30      *__result = __saved;
31      __saved   = __init;
32      ++__result;
33    } while (++__first != __last);
34  }
35  return __result;
36}
37
38#endif // _LIBCPP_STD_VER >= 17
39
40_LIBCPP_END_NAMESPACE_STD
41
42#endif // _LIBCPP___NUMERIC_TRANSFORM_EXCLUSIVE_SCAN_H
43