BufferWriter.h

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/***************************************************************************
 *  ThunderEgg, a library for solvers on adaptively refined block-structured
 *  Cartesian grids.
 *
 *  Copyright (c) 2018-2021 Scott Aiton
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 ***************************************************************************/
 
#ifndef THUNDEREGG_BUFFERWRITER_H
#define THUNDEREGG_BUFFERWRITER_H
 
#include <ThunderEgg/Serializable.h>
#include <cstddef>
#include <iostream>
#include <type_traits>
 
namespace ThunderEgg {
class BufferWriter
{
private:
  char* buffer = nullptr;
  int pos = 0;
 
  template<typename T>
  static constexpr bool isSerializable()
  {
    return std::is_base_of<Serializable, T>::value;
  }
 
public:
  BufferWriter() = default;
  BufferWriter(char* buffer) { this->buffer = buffer; }
  int getPos() { return pos; }
  BufferWriter& operator<<(const Serializable& obj)
  {
    pos += obj.serialize(buffer == nullptr ? nullptr : (buffer + pos));
    return *this;
  }
  template<typename T>
  typename std::enable_if<!isSerializable<T>(), BufferWriter>::type& operator<<(const T& obj)
  {
    if (buffer != nullptr) {
      for (size_t i = 0; i < sizeof(T); i++) {
        buffer[pos] = reinterpret_cast<const char*>(&obj)[i];
        pos++;
      }
    } else {
      pos += sizeof(T);
    }
    return *this;
  }
};
} // namespace ThunderEgg
#endif