58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
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* DeterministicRandom.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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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 FLOW_DETERIMINISTIC_RANDOM_H
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#define FLOW_DETERIMINISTIC_RANDOM_H
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#pragma once
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#include <cinttypes>
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#include "flow/IRandom.h"
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#include "flow/Error.h"
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#include "flow/Trace.h"
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#include "flow/FastRef.h"
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#include <random>
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class DeterministicRandom final : public IRandom, public ReferenceCounted<DeterministicRandom> {
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private:
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std::mt19937 random;
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uint64_t next;
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bool useRandLog;
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uint64_t gen64();
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public:
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DeterministicRandom(uint32_t seed, bool useRandLog = false);
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double random01() override;
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int randomInt(int min, int maxPlusOne) override;
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int64_t randomInt64(int64_t min, int64_t maxPlusOne) override;
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uint32_t randomUInt32() override;
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uint64_t randomUInt64() override;
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uint32_t randomSkewedUInt32(uint32_t min, uint32_t maxPlusOne) override;
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UID randomUniqueID() override;
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char randomAlphaNumeric() override;
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std::string randomAlphaNumeric(int length) override;
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uint64_t peek() const override;
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void addref() override;
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void delref() override;
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};
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#endif
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