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boost::asio::ssl::stream<boost::asio::ip::tcp::socket> socket_;
 boost::asio::io_service io_service;
 
 boost::asio::ip::tcp::resolver resolver(io_service);
//argv[1] et argv[2] correspond a l'adresse et le port de serveur
 boost::asio::ip::tcp::resolver::query query(argv[1], argv[2]);
 boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);
 boost::asio::ip::tcp::endpoint endpoint = *iterator ;
 boost::asio::ssl::context ctx(io_service, boost::asio::ssl::context::sslv23);
 ctx.set_verify_mode(boost::asio::ssl::context::verify_peer);
 ctx.load_verify_file("ca.pem");
 
 socket_(io_service, context)
 
 boost::asio::ip::tcp::endpoint endpoint = *endpoint_iterator;
    socket_.lowest_layer().async_connect(endpoint,
        boost::bind(&client::handle_connect, this,
          boost::asio::placeholders::error, ++endpoint_iterator));
 
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