random_devices.h

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/*
 * This file is part of Quantum++.
 *
 * MIT License
 *
 * Copyright (c) 2013 - 2020 Vlad Gheorghiu.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef CLASSES_RANDOM_DEVICES_H_
#define CLASSES_RANDOM_DEVICES_H_

namespace qpp {
class RandomDevices final : public internal::Singleton<RandomDevices> //
// Singleton
{
    friend class internal::Singleton<RandomDevices>;

    std::random_device rd_; 
    std::mt19937 prng_;     
  public:
    std::mt19937& get_prng() { return prng_; }

    std::istream& load(std::istream& is) { return is >> prng_; }

    std::ostream& save(std::ostream& os) const { return os << prng_; }

  private:
    RandomDevices() : rd_{}, prng_{rd_()} {}

    ~RandomDevices() = default;
}; /* class RandomDevices */

} /* namespace qpp */

#endif /* CLASSES_RANDOM_DEVICES_H_ */