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| 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___CXX03___RANDOM_RANDOM_DEVICE_H |
| 10 | #define _LIBCPP___CXX03___RANDOM_RANDOM_DEVICE_H |
| 11 | |
| 12 | #include <__cxx03/__config> |
| 13 | #include <__cxx03/string> |
| 14 | |
| 15 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 16 | # pragma GCC system_header |
| 17 | #endif |
| 18 | |
| 19 | _LIBCPP_PUSH_MACROS |
| 20 | #include <__cxx03/__undef_macros> |
| 21 | |
| 22 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 23 | |
| 24 | #if !defined(_LIBCPP_HAS_NO_RANDOM_DEVICE) |
| 25 | |
| 26 | class _LIBCPP_EXPORTED_FROM_ABI random_device { |
| 27 | # ifdef _LIBCPP_USING_DEV_RANDOM |
| 28 | int __f_; |
| 29 | # elif !defined(_LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT) |
| 30 | _LIBCPP_DIAGNOSTIC_PUSH |
| 31 | _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-private-field") |
| 32 | |
| 33 | // Apple platforms used to use the `_LIBCPP_USING_DEV_RANDOM` code path, and now |
| 34 | // use `arc4random()` as of this comment. In order to avoid breaking the ABI, we |
| 35 | // retain the same layout as before. |
| 36 | # if defined(__APPLE__) |
| 37 | int __padding_; // padding to fake the `__f_` field above |
| 38 | # endif |
| 39 | |
| 40 | // ... vendors can add workarounds here if they switch to a different representation ... |
| 41 | |
| 42 | _LIBCPP_DIAGNOSTIC_POP |
| 43 | # endif |
| 44 | |
| 45 | public: |
| 46 | // types |
| 47 | typedef unsigned result_type; |
| 48 | |
| 49 | // generator characteristics |
| 50 | static const result_type _Min = 0; |
| 51 | static const result_type _Max = 0xFFFFFFFFu; |
| 52 | |
| 53 | _LIBCPP_HIDE_FROM_ABI static result_type min() { return _Min; } |
| 54 | _LIBCPP_HIDE_FROM_ABI static result_type max() { return _Max; } |
| 55 | |
| 56 | // constructors |
| 57 | explicit random_device(const string& __token = "/dev/urandom"); |
| 58 | ~random_device(); |
| 59 | |
| 60 | // generating functions |
| 61 | result_type operator()(); |
| 62 | |
| 63 | // property functions |
| 64 | double entropy() const _NOEXCEPT; |
| 65 | |
| 66 | random_device(const random_device&) = delete; |
| 67 | void operator=(const random_device&) = delete; |
| 68 | }; |
| 69 | |
| 70 | #endif // !_LIBCPP_HAS_NO_RANDOM_DEVICE |
| 71 | |
| 72 | _LIBCPP_END_NAMESPACE_STD |
| 73 | |
| 74 | _LIBCPP_POP_MACROS |
| 75 | |
| 76 | #endif // _LIBCPP___CXX03___RANDOM_RANDOM_DEVICE_H |
| 77 |
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