libcxx/include/__algorithm/is_partitioned.h

   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
  20 template <class _InputIterator, class _Predicate>
  21 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
  22 is_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