1e78f53d1SNikolas Klauser // -*- C++ -*- 2e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 3e78f53d1SNikolas Klauser // 4e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 6e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7e78f53d1SNikolas Klauser // 8e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 9e78f53d1SNikolas Klauser 10*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___NUMERIC_EXCLUSIVE_SCAN_H 11*ce777190SNikolas Klauser #define _LIBCPP___CXX03___NUMERIC_EXCLUSIVE_SCAN_H 12e78f53d1SNikolas Klauser 1373fbae83SNikolas Klauser #include <__cxx03/__config> 1473fbae83SNikolas Klauser #include <__cxx03/__functional/operations.h> 1573fbae83SNikolas Klauser #include <__cxx03/__utility/move.h> 16e78f53d1SNikolas Klauser 17e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18e78f53d1SNikolas Klauser # pragma GCC system_header 19e78f53d1SNikolas Klauser #endif 20e78f53d1SNikolas Klauser 21e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2273fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 25e78f53d1SNikolas Klauser 26e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 17 27e78f53d1SNikolas Klauser 28e78f53d1SNikolas Klauser template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp> 29e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 30e78f53d1SNikolas Klauser exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) { 31e78f53d1SNikolas Klauser if (__first != __last) { 32e78f53d1SNikolas Klauser _Tp __tmp(__b(__init, *__first)); 33e78f53d1SNikolas Klauser while (true) { 34e78f53d1SNikolas Klauser *__result = std::move(__init); 35e78f53d1SNikolas Klauser ++__result; 36e78f53d1SNikolas Klauser ++__first; 37e78f53d1SNikolas Klauser if (__first == __last) 38e78f53d1SNikolas Klauser break; 39e78f53d1SNikolas Klauser __init = std::move(__tmp); 40e78f53d1SNikolas Klauser __tmp = __b(__init, *__first); 41e78f53d1SNikolas Klauser } 42e78f53d1SNikolas Klauser } 43e78f53d1SNikolas Klauser return __result; 44e78f53d1SNikolas Klauser } 45e78f53d1SNikolas Klauser 46e78f53d1SNikolas Klauser template <class _InputIterator, class _OutputIterator, class _Tp> 47e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 48e78f53d1SNikolas Klauser exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) { 49e78f53d1SNikolas Klauser return std::exclusive_scan(__first, __last, __result, __init, std::plus<>()); 50e78f53d1SNikolas Klauser } 51e78f53d1SNikolas Klauser 52e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 17 53e78f53d1SNikolas Klauser 54e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 55e78f53d1SNikolas Klauser 56e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS 57e78f53d1SNikolas Klauser 58*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___NUMERIC_EXCLUSIVE_SCAN_H 59