//===- FuzzerRandom.h - Internal header for the Fuzzer ----------*- C++ -* ===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

// fuzzer::Random

//===----------------------------------------------------------------------===//

#ifndef LLVM_FUZZER_RANDOM_H

#define LLVM_FUZZER_RANDOM_H

#include <random>

namespace fuzzer {

class Random : public std::mt19937 {

 public:

  Random(unsigned int seed) : std::mt19937(seed) {}

  result_type operator()() { return this->std::mt19937::operator()(); }

  size_t Rand() { return this->operator()(); }

  size_t RandBool() { return Rand() % 2; }

  size_t operator()(size_t n) { return n ? Rand() % n : 0; }

  intptr_t operator()(intptr_t From, intptr_t To) {

    assert(From < To);

    intptr_t RangeSize = To - From + 1;

    return operator()(RangeSize) + From;

  }

};

}  // namespace fuzzer

#endif  // LLVM_FUZZER_RANDOM_H