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_PUSH_MACROS
19 #include <__undef_macros>
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 template <class _InputIterator, class _Predicate>
24 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
25 is_partitioned(_InputIterator __first, _InputIterator __last, _Predicate __pred)
26 {
27     for (; __first != __last; ++__first)
28         if (!__pred(*__first))
29             break;
30     if ( __first == __last )
31         return true;
32     ++__first;
33     for (; __first != __last; ++__first)
34         if (__pred(*__first))
35             return false;
36     return true;
37 }
38 
39 _LIBCPP_END_NAMESPACE_STD
40 
41 _LIBCPP_POP_MACROS
42 
43 #endif // _LIBCPP___ALGORITHM_IS_PARTITIONED_H
44