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 > 14
22
23 template <class _InputIterator, class _OutputIterator, class _Tp,
24 class _BinaryOp, class _UnaryOp>
25 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
26 _OutputIterator
transform_exclusive_scan(_InputIterator __first,_InputIterator __last,_OutputIterator __result,_Tp __init,_BinaryOp __b,_UnaryOp __u)27 transform_exclusive_scan(_InputIterator __first, _InputIterator __last,
28 _OutputIterator __result, _Tp __init,
29 _BinaryOp __b, _UnaryOp __u)
30 {
31 if (__first != __last)
32 {
33 _Tp __saved = __init;
34 do
35 {
36 __init = __b(__init, __u(*__first));
37 *__result = __saved;
38 __saved = __init;
39 ++__result;
40 } while (++__first != __last);
41 }
42 return __result;
43 }
44
45 #endif // _LIBCPP_STD_VER > 14
46
47 _LIBCPP_END_NAMESPACE_STD
48
49 #endif // _LIBCPP___NUMERIC_TRANSFORM_EXCLUSIVE_SCAN_H
50