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

#pragma once

#include <cassert>
#include <memory>

#include <random/forwards.h>

namespace engine::random {
class Random {
private:
  std::shared_ptr<Device> impl_;
  std::shared_ptr<Tape> tape_{nullptr};

public:
  Random();
  Random(Random const & other, Tape & with_tape);
  Random(Random const & other, std::shared_ptr<Tape> with_tape);
  template <typename P> Random(P const & p) : impl_(std::make_shared<P>(p)) {}
  template <typename P> Random(std::shared_ptr<P> const & p) : impl_(p) {}

  template <typename Rand>
  Rand operator()(Distribution<Rand> const & dist) const;

  /**
   * Create a scope in which all calls to the generator functions will record
   * their results into a tape. Expects that there is no tape currently set.
   * @param tape The tape to write to
   * @return A scope object that stops recording once it is descructed
   */
  scope_exit record(std::shared_ptr<Tape> tape);
  std::shared_ptr<Tape> tape() const { return tape_; }
};
}