libcxx/include/__numeric/accumulate.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_ACCUMULATE_H
  11 #define _LIBCPP___NUMERIC_ACCUMULATE_H
  12
  13 #include <__config>
  14 #include <__utility/move.h>
  15
  16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  17 #  pragma GCC system_header
  18 #endif
  19
  20 _LIBCPP_PUSH_MACROS
  21 #include <__undef_macros>
  22
  23 _LIBCPP_BEGIN_NAMESPACE_STD
  24
  25 template <class _InputIterator, class _Tp>
  26 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
  27 accumulate(_InputIterator __first, _InputIterator __last, _Tp __init) {
  28   for (; __first != __last; ++__first)
  29 #if _LIBCPP_STD_VER >= 20
  30     __init = std::move(__init) + *__first;
  31 #else
  32     __init = __init + *__first;
  33 #endif
  34   return __init;
  35 }
  36
  37 template <class _InputIterator, class _Tp, class _BinaryOperation>
  38 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
  39 accumulate(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOperation __binary_op) {
  40   for (; __first != __last; ++__first)
  41 #if _LIBCPP_STD_VER >= 20
  42     __init = __binary_op(std::move(__init), *__first);
  43 #else
  44     __init = __binary_op(__init, *__first);
  45 #endif
  46   return __init;
  47 }
  48
  49 _LIBCPP_END_NAMESPACE_STD
  50
  51 _LIBCPP_POP_MACROS
  52
  53 #endif // _LIBCPP___NUMERIC_ACCUMULATE_H