14824e7fdSDimitry Andric // -*- C++ -*- 24824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 34824e7fdSDimitry Andric // 44824e7fdSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 54824e7fdSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 64824e7fdSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 74824e7fdSDimitry Andric // 84824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 94824e7fdSDimitry Andric 104824e7fdSDimitry Andric #ifndef _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 114824e7fdSDimitry Andric #define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 124824e7fdSDimitry Andric 134824e7fdSDimitry Andric #include <__config> 144824e7fdSDimitry Andric #include <__functional/operations.h> 154824e7fdSDimitry Andric #include <__utility/move.h> 164824e7fdSDimitry Andric 174824e7fdSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 184824e7fdSDimitry Andric # pragma GCC system_header 194824e7fdSDimitry Andric #endif 204824e7fdSDimitry Andric 21*06c3fb27SDimitry Andric _LIBCPP_PUSH_MACROS 22*06c3fb27SDimitry Andric #include <__undef_macros> 23*06c3fb27SDimitry Andric 244824e7fdSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 254824e7fdSDimitry Andric 26*06c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 17 274824e7fdSDimitry Andric 284824e7fdSDimitry Andric template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp> 29bdd1243dSDimitry Andric _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 304824e7fdSDimitry Andric exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) { 314824e7fdSDimitry Andric if (__first != __last) { 324824e7fdSDimitry Andric _Tp __tmp(__b(__init, *__first)); 334824e7fdSDimitry Andric while (true) { 344824e7fdSDimitry Andric *__result = _VSTD::move(__init); 354824e7fdSDimitry Andric ++__result; 364824e7fdSDimitry Andric ++__first; 374824e7fdSDimitry Andric if (__first == __last) 384824e7fdSDimitry Andric break; 394824e7fdSDimitry Andric __init = _VSTD::move(__tmp); 404824e7fdSDimitry Andric __tmp = __b(__init, *__first); 414824e7fdSDimitry Andric } 424824e7fdSDimitry Andric } 434824e7fdSDimitry Andric return __result; 444824e7fdSDimitry Andric } 454824e7fdSDimitry Andric 464824e7fdSDimitry Andric template <class _InputIterator, class _OutputIterator, class _Tp> 47bdd1243dSDimitry Andric _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 484824e7fdSDimitry Andric exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) { 494824e7fdSDimitry Andric return _VSTD::exclusive_scan(__first, __last, __result, __init, _VSTD::plus<>()); 504824e7fdSDimitry Andric } 514824e7fdSDimitry Andric 52*06c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 17 534824e7fdSDimitry Andric 544824e7fdSDimitry Andric _LIBCPP_END_NAMESPACE_STD 554824e7fdSDimitry Andric 56*06c3fb27SDimitry Andric _LIBCPP_POP_MACROS 57*06c3fb27SDimitry Andric 584824e7fdSDimitry Andric #endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 59