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 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
22 is_partitioned(_InputIterator __first, _InputIterator __last, _Predicate __pred)
23 {
24     for (; __first != __last; ++__first)
25         if (!__pred(*__first))
26             break;
27     if ( __first == __last )
28         return true;
29     ++__first;
30     for (; __first != __last; ++__first)
31         if (__pred(*__first))
32             return false;
33     return true;
34 }
35 
36 _LIBCPP_END_NAMESPACE_STD
37 
38 #endif // _LIBCPP___ALGORITHM_IS_PARTITIONED_H
39