1*4bdff4beSrobert // -*- C++ -*-
2*4bdff4beSrobert //===----------------------------------------------------------------------===//
3*4bdff4beSrobert //
4*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
6*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7*4bdff4beSrobert //
8*4bdff4beSrobert //===----------------------------------------------------------------------===//
9*4bdff4beSrobert
10*4bdff4beSrobert #ifndef _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
11*4bdff4beSrobert #define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
12*4bdff4beSrobert
13*4bdff4beSrobert #include <__config>
14*4bdff4beSrobert #include <__functional/operations.h>
15*4bdff4beSrobert #include <__utility/move.h>
16*4bdff4beSrobert
17*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18*4bdff4beSrobert # pragma GCC system_header
19*4bdff4beSrobert #endif
20*4bdff4beSrobert
21*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
22*4bdff4beSrobert
23*4bdff4beSrobert #if _LIBCPP_STD_VER > 14
24*4bdff4beSrobert
25*4bdff4beSrobert template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp>
26*4bdff4beSrobert _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
exclusive_scan(_InputIterator __first,_InputIterator __last,_OutputIterator __result,_Tp __init,_BinaryOp __b)27*4bdff4beSrobert exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) {
28*4bdff4beSrobert if (__first != __last) {
29*4bdff4beSrobert _Tp __tmp(__b(__init, *__first));
30*4bdff4beSrobert while (true) {
31*4bdff4beSrobert *__result = _VSTD::move(__init);
32*4bdff4beSrobert ++__result;
33*4bdff4beSrobert ++__first;
34*4bdff4beSrobert if (__first == __last)
35*4bdff4beSrobert break;
36*4bdff4beSrobert __init = _VSTD::move(__tmp);
37*4bdff4beSrobert __tmp = __b(__init, *__first);
38*4bdff4beSrobert }
39*4bdff4beSrobert }
40*4bdff4beSrobert return __result;
41*4bdff4beSrobert }
42*4bdff4beSrobert
43*4bdff4beSrobert template <class _InputIterator, class _OutputIterator, class _Tp>
44*4bdff4beSrobert _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
exclusive_scan(_InputIterator __first,_InputIterator __last,_OutputIterator __result,_Tp __init)45*4bdff4beSrobert exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) {
46*4bdff4beSrobert return _VSTD::exclusive_scan(__first, __last, __result, __init, _VSTD::plus<>());
47*4bdff4beSrobert }
48*4bdff4beSrobert
49*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 14
50*4bdff4beSrobert
51*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
52*4bdff4beSrobert
53*4bdff4beSrobert #endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
54