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 > 14
23 
24 template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
25 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
26 _OutputIterator
27 transform_inclusive_scan(_InputIterator __first, _InputIterator __last,
28                            _OutputIterator __result, _BinaryOp __b, _UnaryOp __u, _Tp __init)
29 {
30     for (; __first != __last; ++__first, (void) ++__result) {
31         __init = __b(__init, __u(*__first));
32         *__result = __init;
33         }
34 
35     return __result;
36 }
37 
38 template <class _InputIterator, class _OutputIterator, class _BinaryOp, class _UnaryOp>
39 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
40 _OutputIterator
41 transform_inclusive_scan(_InputIterator __first, _InputIterator __last,
42                                _OutputIterator __result, _BinaryOp __b, _UnaryOp __u)
43 {
44     if (__first != __last) {
45         typename iterator_traits<_InputIterator>::value_type __init = __u(*__first);
46         *__result++ = __init;
47         if (++__first != __last)
48             return _VSTD::transform_inclusive_scan(__first, __last, __result, __b, __u, __init);
49     }
50 
51     return __result;
52 }
53 
54 #endif // _LIBCPP_STD_VER > 14
55 
56 _LIBCPP_END_NAMESPACE_STD
57 
58 #endif // _LIBCPP___NUMERIC_TRANSFORM_INCLUSIVE_SCAN_H
59