1//===----------------------------------------------------------------------===//
 2//
 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 4// See https://llvm.org/LICENSE.txt for license information.
 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 6//
 7//===----------------------------------------------------------------------===//
 8
 9#ifndef _LIBCPP___ALGORITHM_IS_PARTITIONED_H
10#define _LIBCPP___ALGORITHM_IS_PARTITIONED_H
11
12#include <__config>
13
14#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15#  pragma GCC system_header
16#endif
17
18_LIBCPP_BEGIN_NAMESPACE_STD
19
20template <class _InputIterator, class _Predicate>
21[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
22is_partitioned(_InputIterator __first, _InputIterator __last, _Predicate __pred) {
23  for (; __first != __last; ++__first)
24    if (!__pred(*__first))
25      break;
26  if (__first == __last)
27    return true;
28  ++__first;
29  for (; __first != __last; ++__first)
30    if (__pred(*__first))
31      return false;
32  return true;
33}
34
35_LIBCPP_END_NAMESPACE_STD
36
37#endif // _LIBCPP___ALGORITHM_IS_PARTITIONED_H