e78f53d1e8
This reverts commit 68c04b0ae6.
This disables the IWYU mapping that caused the failure, since
the headers aren't reachable for now.
This is the first part of the "Freezing C++03 headers" proposal
explained in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319/58.
This patch mechanically copies the headers as of the LLVM 19.1 release
into a subdirectory of libc++ so that we can start using these headers
when building in C++03 mode. We are going to be backporting important
changes to that copy of the headers until the LLVM 21 release. After the
LLVM 21 release, only critical bugfixes will be fixed in the C++03 copy
of the headers.
This patch only performs a copy of the headers -- these headers are
still unused by the rest of the codebase.
168 lines
5.4 KiB
C++
168 lines
5.4 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___ALGORITHM_SHUFFLE_H
|
|
#define _LIBCPP___ALGORITHM_SHUFFLE_H
|
|
|
|
#include <__algorithm/iterator_operations.h>
|
|
#include <__config>
|
|
#include <__iterator/iterator_traits.h>
|
|
#include <__random/uniform_int_distribution.h>
|
|
#include <__utility/forward.h>
|
|
#include <__utility/move.h>
|
|
#include <__utility/swap.h>
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
class _LIBCPP_EXPORTED_FROM_ABI __libcpp_debug_randomizer {
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI __libcpp_debug_randomizer() {
|
|
__state_ = __seed();
|
|
__inc_ = __state_ + 0xda3e39cb94b95bdbULL;
|
|
__inc_ = (__inc_ << 1) | 1;
|
|
}
|
|
typedef uint_fast32_t result_type;
|
|
|
|
static const result_type _Min = 0;
|
|
static const result_type _Max = 0xFFFFFFFF;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI result_type operator()() {
|
|
uint_fast64_t __oldstate = __state_;
|
|
__state_ = __oldstate * 6364136223846793005ULL + __inc_;
|
|
return __oldstate >> 32;
|
|
}
|
|
|
|
static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR result_type min() { return _Min; }
|
|
static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR result_type max() { return _Max; }
|
|
|
|
private:
|
|
uint_fast64_t __state_;
|
|
uint_fast64_t __inc_;
|
|
_LIBCPP_HIDE_FROM_ABI static uint_fast64_t __seed() {
|
|
#ifdef _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY_SEED
|
|
return _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY_SEED;
|
|
#else
|
|
static char __x;
|
|
return reinterpret_cast<uintptr_t>(&__x);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE) || defined(_LIBCPP_BUILDING_LIBRARY)
|
|
class _LIBCPP_EXPORTED_FROM_ABI __rs_default;
|
|
|
|
_LIBCPP_EXPORTED_FROM_ABI __rs_default __rs_get();
|
|
|
|
class _LIBCPP_EXPORTED_FROM_ABI __rs_default {
|
|
static unsigned __c_;
|
|
|
|
__rs_default();
|
|
|
|
public:
|
|
typedef uint_fast32_t result_type;
|
|
|
|
static const result_type _Min = 0;
|
|
static const result_type _Max = 0xFFFFFFFF;
|
|
|
|
__rs_default(const __rs_default&);
|
|
~__rs_default();
|
|
|
|
result_type operator()();
|
|
|
|
static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR result_type min() { return _Min; }
|
|
static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR result_type max() { return _Max; }
|
|
|
|
friend _LIBCPP_EXPORTED_FROM_ABI __rs_default __rs_get();
|
|
};
|
|
|
|
_LIBCPP_EXPORTED_FROM_ABI __rs_default __rs_get();
|
|
|
|
template <class _RandomAccessIterator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_IN_CXX14 void
|
|
random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last) {
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
|
|
typedef uniform_int_distribution<ptrdiff_t> _Dp;
|
|
typedef typename _Dp::param_type _Pp;
|
|
difference_type __d = __last - __first;
|
|
if (__d > 1) {
|
|
_Dp __uid;
|
|
__rs_default __g = __rs_get();
|
|
for (--__last, (void)--__d; __first < __last; ++__first, (void)--__d) {
|
|
difference_type __i = __uid(__g, _Pp(0, __d));
|
|
if (__i != difference_type(0))
|
|
swap(*__first, *(__first + __i));
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class _RandomAccessIterator, class _RandomNumberGenerator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_IN_CXX14 void
|
|
random_shuffle(_RandomAccessIterator __first,
|
|
_RandomAccessIterator __last,
|
|
# ifndef _LIBCPP_CXX03_LANG
|
|
_RandomNumberGenerator&& __rand)
|
|
# else
|
|
_RandomNumberGenerator& __rand)
|
|
# endif
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
|
|
difference_type __d = __last - __first;
|
|
if (__d > 1) {
|
|
for (--__last; __first < __last; ++__first, (void)--__d) {
|
|
difference_type __i = __rand(__d);
|
|
if (__i != difference_type(0))
|
|
swap(*__first, *(__first + __i));
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
template <class _AlgPolicy, class _RandomAccessIterator, class _Sentinel, class _UniformRandomNumberGenerator>
|
|
_LIBCPP_HIDE_FROM_ABI _RandomAccessIterator
|
|
__shuffle(_RandomAccessIterator __first, _Sentinel __last_sentinel, _UniformRandomNumberGenerator&& __g) {
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
|
|
typedef uniform_int_distribution<ptrdiff_t> _Dp;
|
|
typedef typename _Dp::param_type _Pp;
|
|
|
|
auto __original_last = _IterOps<_AlgPolicy>::next(__first, __last_sentinel);
|
|
auto __last = __original_last;
|
|
difference_type __d = __last - __first;
|
|
if (__d > 1) {
|
|
_Dp __uid;
|
|
for (--__last, (void)--__d; __first < __last; ++__first, (void)--__d) {
|
|
difference_type __i = __uid(__g, _Pp(0, __d));
|
|
if (__i != difference_type(0))
|
|
_IterOps<_AlgPolicy>::iter_swap(__first, __first + __i);
|
|
}
|
|
}
|
|
|
|
return __original_last;
|
|
}
|
|
|
|
template <class _RandomAccessIterator, class _UniformRandomNumberGenerator>
|
|
_LIBCPP_HIDE_FROM_ABI void
|
|
shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last, _UniformRandomNumberGenerator&& __g) {
|
|
(void)std::__shuffle<_ClassicAlgPolicy>(
|
|
std::move(__first), std::move(__last), std::forward<_UniformRandomNumberGenerator>(__g));
|
|
}
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___ALGORITHM_SHUFFLE_H
|