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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef BASE_RAND_UTIL_H_ | 5 #ifndef BASE_RAND_UTIL_H_ |
| 6 #define BASE_RAND_UTIL_H_ | 6 #define BASE_RAND_UTIL_H_ |
| 7 #pragma once | 7 #pragma once |
| 8 | 8 |
| 9 #include <string> | 9 #include <string> |
| 10 | 10 |
| 11 #include "base/base_api.h" | 11 #include "base/base_export.h" |
| 12 #include "base/basictypes.h" | 12 #include "base/basictypes.h" |
| 13 | 13 |
| 14 namespace base { | 14 namespace base { |
| 15 | 15 |
| 16 // Returns a random number in range [0, kuint64max]. Thread-safe. | 16 // Returns a random number in range [0, kuint64max]. Thread-safe. |
| 17 BASE_API uint64 RandUint64(); | 17 BASE_EXPORT uint64 RandUint64(); |
| 18 | 18 |
| 19 // Returns a random number between min and max (inclusive). Thread-safe. | 19 // Returns a random number between min and max (inclusive). Thread-safe. |
| 20 BASE_API int RandInt(int min, int max); | 20 BASE_EXPORT int RandInt(int min, int max); |
| 21 | 21 |
| 22 // Returns a random number in range [0, max). Thread-safe. | 22 // Returns a random number in range [0, max). Thread-safe. |
| 23 // | 23 // |
| 24 // Note that this can be used as an adapter for std::random_shuffle(): | 24 // Note that this can be used as an adapter for std::random_shuffle(): |
| 25 // Given a pre-populated |std::vector<int> myvector|, shuffle it as | 25 // Given a pre-populated |std::vector<int> myvector|, shuffle it as |
| 26 // std::random_shuffle(myvector.begin(), myvector.end(), base::RandGenerator); | 26 // std::random_shuffle(myvector.begin(), myvector.end(), base::RandGenerator); |
| 27 BASE_API uint64 RandGenerator(uint64 max); | 27 BASE_EXPORT uint64 RandGenerator(uint64 max); |
| 28 | 28 |
| 29 // Returns a random double in range [0, 1). Thread-safe. | 29 // Returns a random double in range [0, 1). Thread-safe. |
| 30 BASE_API double RandDouble(); | 30 BASE_EXPORT double RandDouble(); |
| 31 | 31 |
| 32 // Given input |bits|, convert with maximum precision to a double in | 32 // Given input |bits|, convert with maximum precision to a double in |
| 33 // the range [0, 1). Thread-safe. | 33 // the range [0, 1). Thread-safe. |
| 34 BASE_API double BitsToOpenEndedUnitInterval(uint64 bits); | 34 BASE_EXPORT double BitsToOpenEndedUnitInterval(uint64 bits); |
| 35 | 35 |
| 36 // Fills |output_length| bytes of |output| with cryptographically strong random | 36 // Fills |output_length| bytes of |output| with cryptographically strong random |
| 37 // data. | 37 // data. |
| 38 BASE_API void RandBytes(void* output, size_t output_length); | 38 BASE_EXPORT void RandBytes(void* output, size_t output_length); |
| 39 | 39 |
| 40 // Fills a string of length |length| with with cryptographically strong random | 40 // Fills a string of length |length| with with cryptographically strong random |
| 41 // data and returns it. | 41 // data and returns it. |
| 42 // | 42 // |
| 43 // Not that this is a variation of |RandBytes| with a different return type. | 43 // Not that this is a variation of |RandBytes| with a different return type. |
| 44 BASE_API std::string RandBytesAsString(size_t length); | 44 BASE_EXPORT std::string RandBytesAsString(size_t length); |
| 45 | 45 |
| 46 } // namespace base | 46 } // namespace base |
| 47 | 47 |
| 48 #endif // BASE_RAND_UTIL_H_ | 48 #endif // BASE_RAND_UTIL_H_ |
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