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51 lines
1.5 KiB
51 lines
1.5 KiB
// |
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// Copyright (C) 2014 The Android Open Source Project |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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#ifndef UPDATE_ENGINE_UPDATE_MANAGER_PRNG_H_ |
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#define UPDATE_ENGINE_UPDATE_MANAGER_PRNG_H_ |
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#include <random> |
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#include <base/logging.h> |
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namespace chromeos_update_manager { |
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// A thread-safe, unsecure, 32-bit pseudo-random number generator based on |
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// std::mt19937. |
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class PRNG { |
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public: |
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// Initializes the generator with the passed |seed| value. |
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explicit PRNG(uint32_t seed) : gen_(seed) {} |
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// Returns a random unsigned 32-bit integer. |
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uint32_t Rand() { return gen_(); } |
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// Returns a random integer uniformly distributed in the range [min, max]. |
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int RandMinMax(int min, int max) { |
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DCHECK_LE(min, max); |
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return std::uniform_int_distribution<>(min, max)(gen_); |
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} |
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private: |
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// A pseudo-random number generator. |
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std::mt19937 gen_; |
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DISALLOW_COPY_AND_ASSIGN(PRNG); |
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}; |
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} // namespace chromeos_update_manager |
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#endif // UPDATE_ENGINE_UPDATE_MANAGER_PRNG_H_
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