binary io lib example

// This file is part of mvcpp - a web based model-view-controller.

// mvcpp 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.

// mvcpp 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 mvcpp. If not, see <http://www.gnu.org/licenses/>.
//
// (C) Copyright 2016 by Sebastian Büttner <sebastian.buettner@powerserverplus.net>

#include <io/buffer.hpp>
#include <io/binary_reader.hpp>
#include <io/binary_writer.hpp>

#include <iostream>
#include <arpa/inet.h>

struct my_header
{
  uint16_t data_length;
};

namespace io
{

template<typename T, typename Traits>
struct pack_traits<T, Traits, my_header>
{
  static void pack(basic_binary_writer<T, Traits> &writer, const my_header &header)
  {
    writer << ::htons(header.data_length);
  }

  static void unpack(basic_binary_reader<T, Traits> &reader, my_header &header)
  {
    reader >> header.data_length;
    ::ntohs(header.data_length);
  }
};

}

int main()
{
  io::buffer buf;

  {
    auto writer = io::make_binary_writer(buf);

    my_header header{
      .data_length = 1024,
    };
    writer << header;
  }

  {
    auto reader = io::make_binary_reader(buf);

    my_header header;
    reader >> header;
    std::cout << "header.data_length = " << header.data_length << std::endl;
  }

  return 0;
}