cpp-shared-random-generator/src/distribution.cxx

//
//  distribution.cpp
//  shared_random_generator
//
//  Created by Sam Jaffe on 3/25/23.
//  Copyright © 2023 Sam Jaffe. All rights reserved.
//

#include "random/distribution.h"

#include <iostream>
#include <random>
#include <sstream>

#include "random/device.h"

#define INSTANTIATE_DISTRIBUTION_TEMPLATES(T)                                  \
  template std::string to_string(Distribution<T> const &);                     \
  template class Uniform<T>;

namespace engine::random {
template <typename T> std::string to_string(Distribution<T> const & dist) {
  std::stringstream ss;
  ss << dist;
  return ss.str();
}

template <typename Rand>
Uniform<Rand>::Uniform(Rand min)
    : Uniform(min, std::numeric_limits<Rand>::max()) {}

template <typename Rand>
Uniform<Rand>::Uniform(Rand min, Rand max) : min_(min), max_(max) {}

template <typename Rand>
auto Uniform<Rand>::operator()(Device & device) const -> result_type {
  if constexpr (std::is_floating_point_v<Rand>) {
    return std::uniform_real_distribution<Rand>(min_, max_)(device);
  } else {
    return std::uniform_int_distribution<Rand>(min_, max_)(device);
  }
}

template <typename Rand> void Uniform<Rand>::describe(std::ostream & os) const {
  constexpr char close = std::is_floating_point_v<Rand> ? ')' : ']';
  os << typeid(Rand).name() << "Uniform[" << min_ << ',' << max_ << close;
}

IMPLEMENT_DEVICE(INSTANTIATE_DISTRIBUTION_TEMPLATES)
}