xref: /openbsd-src/gnu/llvm/libcxx/include/__numeric/reduce.h (revision 4bdff4bed0e3d54e55670334c7d0077db4170f86)
1*4bdff4beSrobert // -*- C++ -*-
2*4bdff4beSrobert //===----------------------------------------------------------------------===//
3*4bdff4beSrobert //
4*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
6*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7*4bdff4beSrobert //
8*4bdff4beSrobert //===----------------------------------------------------------------------===//
9*4bdff4beSrobert 
10*4bdff4beSrobert #ifndef _LIBCPP___NUMERIC_REDUCE_H
11*4bdff4beSrobert #define _LIBCPP___NUMERIC_REDUCE_H
12*4bdff4beSrobert 
13*4bdff4beSrobert #include <__config>
14*4bdff4beSrobert #include <__functional/operations.h>
15*4bdff4beSrobert #include <__iterator/iterator_traits.h>
16*4bdff4beSrobert 
17*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18*4bdff4beSrobert #  pragma GCC system_header
19*4bdff4beSrobert #endif
20*4bdff4beSrobert 
21*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
22*4bdff4beSrobert 
23*4bdff4beSrobert #if _LIBCPP_STD_VER > 14
24*4bdff4beSrobert template <class _InputIterator, class _Tp, class _BinaryOp>
reduce(_InputIterator __first,_InputIterator __last,_Tp __init,_BinaryOp __b)25*4bdff4beSrobert _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp reduce(_InputIterator __first, _InputIterator __last,
26*4bdff4beSrobert                                                                    _Tp __init, _BinaryOp __b) {
27*4bdff4beSrobert   for (; __first != __last; ++__first)
28*4bdff4beSrobert     __init = __b(__init, *__first);
29*4bdff4beSrobert   return __init;
30*4bdff4beSrobert }
31*4bdff4beSrobert 
32*4bdff4beSrobert template <class _InputIterator, class _Tp>
reduce(_InputIterator __first,_InputIterator __last,_Tp __init)33*4bdff4beSrobert _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp reduce(_InputIterator __first, _InputIterator __last,
34*4bdff4beSrobert                                                                    _Tp __init) {
35*4bdff4beSrobert   return _VSTD::reduce(__first, __last, __init, _VSTD::plus<>());
36*4bdff4beSrobert }
37*4bdff4beSrobert 
38*4bdff4beSrobert template <class _InputIterator>
39*4bdff4beSrobert _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 typename iterator_traits<_InputIterator>::value_type
reduce(_InputIterator __first,_InputIterator __last)40*4bdff4beSrobert reduce(_InputIterator __first, _InputIterator __last) {
41*4bdff4beSrobert   return _VSTD::reduce(__first, __last, typename iterator_traits<_InputIterator>::value_type{});
42*4bdff4beSrobert }
43*4bdff4beSrobert #endif
44*4bdff4beSrobert 
45*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
46*4bdff4beSrobert 
47*4bdff4beSrobert #endif // _LIBCPP___NUMERIC_REDUCE_H
48