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 >= 17
23
24 template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
transform_inclusive_scan(_InputIterator __first,_InputIterator __last,_OutputIterator __result,_BinaryOp __b,_UnaryOp __u,_Tp __init)25 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator transform_inclusive_scan(
26 _InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b, _UnaryOp __u, _Tp __init) {
27 for (; __first != __last; ++__first, (void)++__result) {
28 __init = __b(__init, __u(*__first));
29 *__result = __init;
30 }
31
32 return __result;
33 }
34
35 template <class _InputIterator, class _OutputIterator, class _BinaryOp, class _UnaryOp>
transform_inclusive_scan(_InputIterator __first,_InputIterator __last,_OutputIterator __result,_BinaryOp __b,_UnaryOp __u)36 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator transform_inclusive_scan(
37 _InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b, _UnaryOp __u) {
38 if (__first != __last) {
39 typename iterator_traits<_InputIterator>::value_type __init = __u(*__first);
40 *__result++ = __init;
41 if (++__first != __last)
42 return std::transform_inclusive_scan(__first, __last, __result, __b, __u, __init);
43 }
44
45 return __result;
46 }
47
48 #endif // _LIBCPP_STD_VER >= 17
49
50 _LIBCPP_END_NAMESPACE_STD
51
52 #endif // _LIBCPP___NUMERIC_TRANSFORM_INCLUSIVE_SCAN_H
53