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
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