344cef6695
Actually there's one functional change here, which is that users can no longer depend on <random> to include all of C++20 <concepts>. That inclusion is so new that we believe nobody should be depending on it yet, even in the presence of Hyrum's Law. We keep the includes of <vector>, <algorithm>, etc., so as not to break pre-C++20 Hyrum's Law users. Differential Revision: https://reviews.llvm.org/D114281
72 lines
1.9 KiB
C++
72 lines
1.9 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___RANDOM_RANDOM_DEVICE_H
|
|
#define _LIBCPP___RANDOM_RANDOM_DEVICE_H
|
|
|
|
#include <__config>
|
|
#include <string>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
#pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_RANDOM_DEVICE)
|
|
|
|
class _LIBCPP_TYPE_VIS random_device
|
|
{
|
|
#ifdef _LIBCPP_USING_DEV_RANDOM
|
|
int __f_;
|
|
#endif // defined(_LIBCPP_USING_DEV_RANDOM)
|
|
public:
|
|
// types
|
|
typedef unsigned result_type;
|
|
|
|
// generator characteristics
|
|
static _LIBCPP_CONSTEXPR const result_type _Min = 0;
|
|
static _LIBCPP_CONSTEXPR const result_type _Max = 0xFFFFFFFFu;
|
|
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
static _LIBCPP_CONSTEXPR result_type min() { return _Min;}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
static _LIBCPP_CONSTEXPR result_type max() { return _Max;}
|
|
|
|
// constructors
|
|
#ifndef _LIBCPP_CXX03_LANG
|
|
random_device() : random_device("/dev/urandom") {}
|
|
explicit random_device(const string& __token);
|
|
#else
|
|
explicit random_device(const string& __token = "/dev/urandom");
|
|
#endif
|
|
~random_device();
|
|
|
|
// generating functions
|
|
result_type operator()();
|
|
|
|
// property functions
|
|
double entropy() const _NOEXCEPT;
|
|
|
|
private:
|
|
// no copy functions
|
|
random_device(const random_device&); // = delete;
|
|
random_device& operator=(const random_device&); // = delete;
|
|
};
|
|
|
|
#endif // !_LIBCPP_HAS_NO_RANDOM_DEVICE
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___RANDOM_RANDOM_DEVICE_H
|