__cxx03/__numeric/transform_reduce.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___CXX03___NUMERIC_TRANSFORM_REDUCE_H
0011 #define _LIBCPP___CXX03___NUMERIC_TRANSFORM_REDUCE_H
0012
0013 #include <__cxx03/__config>
0014 #include <__cxx03/__functional/operations.h>
0015 #include <__cxx03/__utility/move.h>
0016
0017 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0018 #  pragma GCC system_header
0019 #endif
0020
0021 _LIBCPP_PUSH_MACROS
0022 #include <__cxx03/__undef_macros>
0023
0024 _LIBCPP_BEGIN_NAMESPACE_STD
0025
0026 #if _LIBCPP_STD_VER >= 17
0027 template <class _InputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
0028 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
0029 transform_reduce(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOp __b, _UnaryOp __u) {
0030   for (; __first != __last; ++__first)
0031     __init = __b(std::move(__init), __u(*__first));
0032   return __init;
0033 }
0034
0035 template <class _InputIterator1, class _InputIterator2, class _Tp, class _BinaryOp1, class _BinaryOp2>
0036 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp transform_reduce(
0037     _InputIterator1 __first1,
0038     _InputIterator1 __last1,
0039     _InputIterator2 __first2,
0040     _Tp __init,
0041     _BinaryOp1 __b1,
0042     _BinaryOp2 __b2) {
0043   for (; __first1 != __last1; ++__first1, (void)++__first2)
0044     __init = __b1(std::move(__init), __b2(*__first1, *__first2));
0045   return __init;
0046 }
0047
0048 template <class _InputIterator1, class _InputIterator2, class _Tp>
0049 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
0050 transform_reduce(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _Tp __init) {
0051   return std::transform_reduce(__first1, __last1, __first2, std::move(__init), std::plus<>(), std::multiplies<>());
0052 }
0053 #endif
0054
0055 _LIBCPP_END_NAMESPACE_STD
0056
0057 _LIBCPP_POP_MACROS
0058
0059 #endif // _LIBCPP___CXX03___NUMERIC_TRANSFORM_REDUCE_H