libcxx/include/__debug_utils/randomize_range.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___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 void __debug_randomize_range(_Iterator __first, _Sentinel __last) {
  27 #ifdef _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY
  28 #  ifdef _LIBCPP_CXX03_LANG
  29 #    error Support for unspecified stability is only for C++11 and higher
  30 #  endif
  31
  32   if (!__libcpp_is_constant_evaluated())
  33     std::__shuffle<_AlgPolicy>(__first, __last, __libcpp_debug_randomizer());
  34 #else
  35   (void)__first;
  36   (void)__last;
  37 #endif
  38 }
  39
  40 _LIBCPP_END_NAMESPACE_STD
  41
  42 #endif // _LIBCPP___LIBCXX_DEBUG_RANDOMIZE_RANGE_H