text: // Copyright (c) 2012-2017, The CryptoNote developers, The Bytecoin developers
  // Copyright (c) 2018-2020, The Qwertycoin Project
  //
  // This file is part of Qwertycoin.
  //
  // Qwertycoin is free software: you can redistribute it and/or modify
  // it under the terms of the GNU Lesser General Public License as published by
  // the Free Software Foundation, either version 3 of the License, or
  // (at your option) any later version.
  //
  // Qwertycoin is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public License
  // along with Qwertycoin.  If not, see <http://www.gnu.org/licenses/>.
  
  #pragma once
  
  #include <cstdint>
  #include <string>
  #include <system_error>
  
  namespace System {
  
      class MemoryMappedFile
      {
      public:
          MemoryMappedFile();
          ~MemoryMappedFile();
  
          void create(const std::string &path, uint64_t size, bool overwrite, std::error_code &ec);
          void create(const std::string &path, uint64_t size, bool overwrite);
          void open(const std::string &path, std::error_code &ec);
          void open(const std::string &path);
          void close(std::error_code &ec);
          void close();
  
          const std::string &path() const;
          uint64_t size() const;
          const uint8_t *data() const;
          uint8_t *data();
          bool isOpened() const;
  
          void rename(const std::string &newPath, std::error_code &ec);
          void rename(const std::string &newPath);
  
          void flush(uint8_t *data, uint64_t size, std::error_code &ec);
          void flush(uint8_t *data, uint64_t size);
  
          void swap(MemoryMappedFile &other);
  
      private:
          int m_file;
          std::string m_path;
          uint64_t m_size;
          uint8_t *m_data;
      };
  
  }
  