xref: /llvm-project/libcxx/include/__cxx03/__numeric/reduce.h (revision ce7771902dc50d900de639d499a60486b83f70e0)
1e78f53d1SNikolas Klauser // -*- C++ -*-
2e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===//
3e78f53d1SNikolas Klauser //
4e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information.
6e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7e78f53d1SNikolas Klauser //
8e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===//
9e78f53d1SNikolas Klauser 
10*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___NUMERIC_REDUCE_H
11*ce777190SNikolas Klauser #define _LIBCPP___CXX03___NUMERIC_REDUCE_H
12e78f53d1SNikolas Klauser 
1373fbae83SNikolas Klauser #include <__cxx03/__config>
1473fbae83SNikolas Klauser #include <__cxx03/__functional/operations.h>
1573fbae83SNikolas Klauser #include <__cxx03/__iterator/iterator_traits.h>
1673fbae83SNikolas Klauser #include <__cxx03/__utility/move.h>
17e78f53d1SNikolas Klauser 
18e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19e78f53d1SNikolas Klauser #  pragma GCC system_header
20e78f53d1SNikolas Klauser #endif
21e78f53d1SNikolas Klauser 
22e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS
2373fbae83SNikolas Klauser #include <__cxx03/__undef_macros>
24e78f53d1SNikolas Klauser 
25e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD
26e78f53d1SNikolas Klauser 
27e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 17
28e78f53d1SNikolas Klauser template <class _InputIterator, class _Tp, class _BinaryOp>
29e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
30e78f53d1SNikolas Klauser reduce(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOp __b) {
31e78f53d1SNikolas Klauser   for (; __first != __last; ++__first)
32e78f53d1SNikolas Klauser     __init = __b(std::move(__init), *__first);
33e78f53d1SNikolas Klauser   return __init;
34e78f53d1SNikolas Klauser }
35e78f53d1SNikolas Klauser 
36e78f53d1SNikolas Klauser template <class _InputIterator, class _Tp>
37e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
38e78f53d1SNikolas Klauser reduce(_InputIterator __first, _InputIterator __last, _Tp __init) {
39e78f53d1SNikolas Klauser   return std::reduce(__first, __last, __init, std::plus<>());
40e78f53d1SNikolas Klauser }
41e78f53d1SNikolas Klauser 
42e78f53d1SNikolas Klauser template <class _InputIterator>
43e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 typename iterator_traits<_InputIterator>::value_type
44e78f53d1SNikolas Klauser reduce(_InputIterator __first, _InputIterator __last) {
45e78f53d1SNikolas Klauser   return std::reduce(__first, __last, typename iterator_traits<_InputIterator>::value_type{});
46e78f53d1SNikolas Klauser }
47e78f53d1SNikolas Klauser #endif
48e78f53d1SNikolas Klauser 
49e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD
50e78f53d1SNikolas Klauser 
51e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS
52e78f53d1SNikolas Klauser 
53*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___NUMERIC_REDUCE_H
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