derek.holloway
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84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANDOM_RANDOM_DEVICE_H
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#define _LIBCPP___RANDOM_RANDOM_DEVICE_H
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#include <__config>
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#include <string>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
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#if _LIBCPP_HAS_RANDOM_DEVICE
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class _LIBCPP_EXPORTED_FROM_ABI random_device {
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# ifdef _LIBCPP_USING_DEV_RANDOM
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int __f_;
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# elif !defined(_LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT)
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_LIBCPP_DIAGNOSTIC_PUSH
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_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-private-field")
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// Apple platforms used to use the `_LIBCPP_USING_DEV_RANDOM` code path, and now
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// use `arc4random()` as of this comment. In order to avoid breaking the ABI, we
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// retain the same layout as before.
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# if defined(__APPLE__)
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int __padding_; // padding to fake the `__f_` field above
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# endif
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// ... vendors can add workarounds here if they switch to a different representation ...
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_LIBCPP_DIAGNOSTIC_POP
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# endif
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public:
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// types
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typedef unsigned result_type;
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// generator characteristics
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static _LIBCPP_CONSTEXPR const result_type _Min = 0;
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static _LIBCPP_CONSTEXPR const result_type _Max = 0xFFFFFFFFu;
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_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR result_type min() { return _Min; }
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_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR result_type max() { return _Max; }
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// constructors
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# ifndef _LIBCPP_CXX03_LANG
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_LIBCPP_HIDE_FROM_ABI random_device() : random_device("/dev/urandom") {}
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explicit random_device(const string& __token);
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# else
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explicit random_device(const string& __token = "/dev/urandom");
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# endif
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~random_device();
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// generating functions
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result_type operator()();
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// property functions
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double entropy() const _NOEXCEPT;
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random_device(const random_device&) = delete;
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void operator=(const random_device&) = delete;
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};
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#endif // _LIBCPP_HAS_RANDOM_DEVICE
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_LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___RANDOM_RANDOM_DEVICE_H
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