diff options
Diffstat (limited to 'contrib/llvm-project/libcxx/include/__numeric/inclusive_scan.h')
-rw-r--r-- | contrib/llvm-project/libcxx/include/__numeric/inclusive_scan.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__numeric/inclusive_scan.h b/contrib/llvm-project/libcxx/include/__numeric/inclusive_scan.h new file mode 100644 index 000000000000..a6b005075835 --- /dev/null +++ b/contrib/llvm-project/libcxx/include/__numeric/inclusive_scan.h @@ -0,0 +1,60 @@ +// -*- C++ -*- +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP___NUMERIC_INCLUSIVE_SCAN_H +#define _LIBCPP___NUMERIC_INCLUSIVE_SCAN_H + +#include <__config> +#include <__functional/operations.h> +#include <__iterator/iterator_traits.h> +#include <__utility/move.h> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +# pragma GCC system_header +#endif + +_LIBCPP_BEGIN_NAMESPACE_STD + +#if _LIBCPP_STD_VER > 14 + +template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp> +_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator +inclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b, _Tp __init) { + for (; __first != __last; ++__first, (void)++__result) { + __init = __b(__init, *__first); + *__result = __init; + } + return __result; +} + +template <class _InputIterator, class _OutputIterator, class _BinaryOp> +_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator +inclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b) { + if (__first != __last) { + typename iterator_traits<_InputIterator>::value_type __init = *__first; + *__result++ = __init; + if (++__first != __last) + return _VSTD::inclusive_scan(__first, __last, __result, __b, __init); + } + + return __result; +} + +template <class _InputIterator, class _OutputIterator> +_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator inclusive_scan(_InputIterator __first, + _InputIterator __last, + _OutputIterator __result) { + return _VSTD::inclusive_scan(__first, __last, __result, _VSTD::plus<>()); +} + +#endif // _LIBCPP_STD_VER > 14 + +_LIBCPP_END_NAMESPACE_STD + +#endif // _LIBCPP___NUMERIC_INCLUSIVE_SCAN_H |