1*4824e7fdSDimitry Andric // -*- C++ -*- 2*4824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 3*4824e7fdSDimitry Andric // 4*4824e7fdSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5*4824e7fdSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6*4824e7fdSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7*4824e7fdSDimitry Andric // 8*4824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 9*4824e7fdSDimitry Andric 10*4824e7fdSDimitry Andric #ifndef _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 11*4824e7fdSDimitry Andric #define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 12*4824e7fdSDimitry Andric 13*4824e7fdSDimitry Andric #include <__config> 14*4824e7fdSDimitry Andric #include <__functional/operations.h> 15*4824e7fdSDimitry Andric #include <__utility/move.h> 16*4824e7fdSDimitry Andric 17*4824e7fdSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18*4824e7fdSDimitry Andric # pragma GCC system_header 19*4824e7fdSDimitry Andric #endif 20*4824e7fdSDimitry Andric 21*4824e7fdSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 22*4824e7fdSDimitry Andric 23*4824e7fdSDimitry Andric #if _LIBCPP_STD_VER > 14 24*4824e7fdSDimitry Andric 25*4824e7fdSDimitry Andric template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp> 26*4824e7fdSDimitry Andric _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 27*4824e7fdSDimitry Andric exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) { 28*4824e7fdSDimitry Andric if (__first != __last) { 29*4824e7fdSDimitry Andric _Tp __tmp(__b(__init, *__first)); 30*4824e7fdSDimitry Andric while (true) { 31*4824e7fdSDimitry Andric *__result = _VSTD::move(__init); 32*4824e7fdSDimitry Andric ++__result; 33*4824e7fdSDimitry Andric ++__first; 34*4824e7fdSDimitry Andric if (__first == __last) 35*4824e7fdSDimitry Andric break; 36*4824e7fdSDimitry Andric __init = _VSTD::move(__tmp); 37*4824e7fdSDimitry Andric __tmp = __b(__init, *__first); 38*4824e7fdSDimitry Andric } 39*4824e7fdSDimitry Andric } 40*4824e7fdSDimitry Andric return __result; 41*4824e7fdSDimitry Andric } 42*4824e7fdSDimitry Andric 43*4824e7fdSDimitry Andric template <class _InputIterator, class _OutputIterator, class _Tp> 44*4824e7fdSDimitry Andric _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 45*4824e7fdSDimitry Andric exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) { 46*4824e7fdSDimitry Andric return _VSTD::exclusive_scan(__first, __last, __result, __init, _VSTD::plus<>()); 47*4824e7fdSDimitry Andric } 48*4824e7fdSDimitry Andric 49*4824e7fdSDimitry Andric #endif // _LIBCPP_STD_VER > 14 50*4824e7fdSDimitry Andric 51*4824e7fdSDimitry Andric _LIBCPP_END_NAMESPACE_STD 52*4824e7fdSDimitry Andric 53*4824e7fdSDimitry Andric #endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 54