libcxx/include/__numeric/transform_reduce.h

   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_TRANSFORM_REDUCE_H
  11 #define _LIBCPP___NUMERIC_TRANSFORM_REDUCE_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 template <class _InputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
  25 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _Tp transform_reduce(_InputIterator __first,
  26                                                                              _InputIterator __last, _Tp __init,
  27                                                                              _BinaryOp __b, _UnaryOp __u) {
  28   for (; __first != __last; ++__first)
  29     __init = __b(__init, __u(*__first));
  30   return __init;
  31 }
  32
  33 template <class _InputIterator1, class _InputIterator2, class _Tp, class _BinaryOp1, class _BinaryOp2>
  34 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _Tp transform_reduce(_InputIterator1 __first1,
  35                                                                              _InputIterator1 __last1,
  36                                                                              _InputIterator2 __first2, _Tp __init,
  37                                                                              _BinaryOp1 __b1, _BinaryOp2 __b2) {
  38   for (; __first1 != __last1; ++__first1, (void)++__first2)
  39     __init = __b1(__init, __b2(*__first1, *__first2));
  40   return __init;
  41 }
  42
  43 template <class _InputIterator1, class _InputIterator2, class _Tp>
  44 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _Tp transform_reduce(_InputIterator1 __first1,
  45                                                                              _InputIterator1 __last1,
  46                                                                              _InputIterator2 __first2, _Tp __init) {
  47   return _VSTD::transform_reduce(__first1, __last1, __first2, _VSTD::move(__init), _VSTD::plus<>(),
  48                                  _VSTD::multiplies<>());
  49 }
  50 #endif
  51
  52 _LIBCPP_END_NAMESPACE_STD
  53
  54 #endif // _LIBCPP___NUMERIC_TRANSFORM_REDUCE_H