include/__algorithm/is_partitioned.h

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_IS_PARTITIONED_H
#define _LIBCPP___ALGORITHM_IS_PARTITIONED_H

#include <__config>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _InputIterator, class _Predicate>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
is_partitioned(_InputIterator __first, _InputIterator __last, _Predicate __pred) {
  for (; __first != __last; ++__first)
    if (!__pred(*__first))
      break;
  if (__first == __last)
    return true;
  ++__first;
  for (; __first != __last; ++__first)
    if (__pred(*__first))
      return false;
  return true;
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_IS_PARTITIONED_H