58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
|
|
* DeterministicRandom.h
|
|
*
|
|
* This source file is part of the FoundationDB open source project
|
|
*
|
|
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef FLOW_DETERIMINISTIC_RANDOM_H
|
|
#define FLOW_DETERIMINISTIC_RANDOM_H
|
|
#pragma once
|
|
|
|
#include <cinttypes>
|
|
#include "flow/IRandom.h"
|
|
#include "flow/Error.h"
|
|
#include "flow/Trace.h"
|
|
#include "flow/FastRef.h"
|
|
|
|
#include <random>
|
|
|
|
class DeterministicRandom : public IRandom, public ReferenceCounted<DeterministicRandom> {
|
|
private:
|
|
std::mt19937 random;
|
|
uint64_t next;
|
|
bool useRandLog;
|
|
|
|
uint64_t gen64();
|
|
|
|
public:
|
|
DeterministicRandom(uint32_t seed, bool useRandLog = false);
|
|
double random01() override;
|
|
int randomInt(int min, int maxPlusOne) override;
|
|
int64_t randomInt64(int64_t min, int64_t maxPlusOne) override;
|
|
uint32_t randomUInt32() override;
|
|
uint64_t randomUInt64() override;
|
|
uint32_t randomSkewedUInt32(uint32_t min, uint32_t maxPlusOne) override;
|
|
UID randomUniqueID() override;
|
|
char randomAlphaNumeric() override;
|
|
std::string randomAlphaNumeric(int length) override;
|
|
uint64_t peek() const override;
|
|
void addref() override;
|
|
void delref() override;
|
|
};
|
|
|
|
#endif
|