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
23 template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
transform_exclusive_scan(_InputIterator __first,_InputIterator __last,_OutputIterator __result,_Tp __init,_BinaryOp __b,_UnaryOp __u)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