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___LIBCXX_DEBUG_RANDOMIZE_RANGE_H
10 #define _LIBCPP___LIBCXX_DEBUG_RANDOMIZE_RANGE_H
11 
12 #include <__config>
13 
14 #ifdef _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY
15 #  include <__algorithm/shuffle.h>
16 #  include <__type_traits/is_constant_evaluated.h>
17 #endif
18 
19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20 #  pragma GCC system_header
21 #endif
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 template <class _AlgPolicy, class _Iterator, class _Sentinel>
26 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
27 void __debug_randomize_range(_Iterator __first, _Sentinel __last) {
28 #ifdef _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY
29 #  ifdef _LIBCPP_CXX03_LANG
30 #    error Support for unspecified stability is only for C++11 and higher
31 #  endif
32 
33   if (!__libcpp_is_constant_evaluated())
34     std::__shuffle<_AlgPolicy>(__first, __last, __libcpp_debug_randomizer());
35 #else
36   (void)__first;
37   (void)__last;
38 #endif
39 }
40 
41 _LIBCPP_END_NAMESPACE_STD
42 
43 #endif // _LIBCPP___LIBCXX_DEBUG_RANDOMIZE_RANGE_H
44