cpp-shared-random-generator/include/random/tape.h

//
//  tape.hpp
//  shared_random_generator
//
//  Created by Sam Jaffe on 3/19/23.
//  Copyright © 2023 Sam Jaffe. All rights reserved.
//

#pragma once

#include <utility>
#include <vector>

#include <random/device.h>

#define DECLARE_TAPE(T)                                                        \
  T apply(Distribution<T> const & dist) final;                                 \
  T apply(Distribution<T> const & dist, T value);

namespace engine::random {
class Tape : public Device {
public:
  // Allow for the serialization and de-serialization of this Tape
  using serial_type = std::vector<std::pair<std::string, uint64_t>>;
  friend class Random;

private:
  size_t index_{0}; // transient
  serial_type entries_;
  std::shared_ptr<Tape> child_{nullptr};

public:
  Tape() = default;
  Tape(std::shared_ptr<Tape> child) : child_(child) {}
  Tape(serial_type serial) : entries_(std::move(serial)) {}
  explicit operator serial_type() const { return entries_; }

private:
  IMPLEMENT_DEVICE(DECLARE_TAPE)

  result_type operator()() final { throw; }
  template <typename T> T poll(std::string const & dist);
  template <typename T> T operator()(Distribution<T> const & dist);
};
}

#undef DECLARE_TAPE