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52 lines
1.5 KiB
52 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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