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_BEGIN_NAMESPACE_STD
  21
  22 template <class _InputIterator, class _Tp>
  23 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
  24 _Tp
  25 accumulate(_InputIterator __first, _InputIterator __last, _Tp __init)
  26 {
  27     for (; __first != __last; ++__first)
  28 #if _LIBCPP_STD_VER > 17
  29         __init = _VSTD::move(__init) + *__first;
  30 #else
  31         __init = __init + *__first;
  32 #endif
  33     return __init;
  34 }
  35
  36 template <class _InputIterator, class _Tp, class _BinaryOperation>
  37 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
  38 _Tp
  39 accumulate(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOperation __binary_op)
  40 {
  41     for (; __first != __last; ++__first)
  42 #if _LIBCPP_STD_VER > 17
  43         __init = __binary_op(_VSTD::move(__init), *__first);
  44 #else
  45         __init = __binary_op(__init, *__first);
  46 #endif
  47     return __init;
  48 }
  49
  50 _LIBCPP_END_NAMESPACE_STD
  51
  52 #endif // _LIBCPP___NUMERIC_ACCUMULATE_H