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_EXCLUSIVE_SCAN_H 11 #define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 12 13 #include <__config> 14 #include <__functional/operations.h> 15 #include <__utility/move.h> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 #if _LIBCPP_STD_VER > 14 24 25 template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp> 26 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 27 exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) { 28 if (__first != __last) { 29 _Tp __tmp(__b(__init, *__first)); 30 while (true) { 31 *__result = _VSTD::move(__init); 32 ++__result; 33 ++__first; 34 if (__first == __last) 35 break; 36 __init = _VSTD::move(__tmp); 37 __tmp = __b(__init, *__first); 38 } 39 } 40 return __result; 41 } 42 43 template <class _InputIterator, class _OutputIterator, class _Tp> 44 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 45 exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) { 46 return _VSTD::exclusive_scan(__first, __last, __result, __init, _VSTD::plus<>()); 47 } 48 49 #endif // _LIBCPP_STD_VER > 14 50 51 _LIBCPP_END_NAMESPACE_STD 52 53 #endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 54