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- //
- // reference_counted.cpp
- // ~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- #include <boost/asio.hpp>
- #include <boost/bind.hpp>
- #include <boost/enable_shared_from_this.hpp>
- #include <boost/shared_ptr.hpp>
- #include <iostream>
- #include <vector>
- using boost::asio::ip::tcp;
- // A reference-counted non-modifiable buffer class.
- class shared_const_buffer
- {
- public:
- // Construct from a std::string.
- explicit shared_const_buffer(const std::string& data)
- : data_(new std::vector<char>(data.begin(), data.end())),
- buffer_(boost::asio::buffer(*data_))
- {
- }
- // Implement the ConstBufferSequence requirements.
- typedef boost::asio::const_buffer value_type;
- typedef const boost::asio::const_buffer* const_iterator;
- const boost::asio::const_buffer* begin() const { return &buffer_; }
- const boost::asio::const_buffer* end() const { return &buffer_ + 1; }
- private:
- boost::shared_ptr<std::vector<char> > data_;
- boost::asio::const_buffer buffer_;
- };
- class session
- : public boost::enable_shared_from_this<session>
- {
- public:
- session(boost::asio::io_context& io_context)
- : socket_(io_context)
- {
- }
- tcp::socket& socket()
- {
- return socket_;
- }
- void start()
- {
- using namespace std; // For time_t, time and ctime.
- time_t now = time(0);
- shared_const_buffer buffer(ctime(&now));
- boost::asio::async_write(socket_, buffer,
- boost::bind(&session::handle_write, shared_from_this()));
- }
- void handle_write()
- {
- }
- private:
- // The socket used to communicate with the client.
- tcp::socket socket_;
- };
- typedef boost::shared_ptr<session> session_ptr;
- class server
- {
- public:
- server(boost::asio::io_context& io_context, short port)
- : io_context_(io_context),
- acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
- {
- session_ptr new_session(new session(io_context_));
- acceptor_.async_accept(new_session->socket(),
- boost::bind(&server::handle_accept, this, new_session,
- boost::asio::placeholders::error));
- }
- void handle_accept(session_ptr new_session,
- const boost::system::error_code& error)
- {
- if (!error)
- {
- new_session->start();
- }
- new_session.reset(new session(io_context_));
- acceptor_.async_accept(new_session->socket(),
- boost::bind(&server::handle_accept, this, new_session,
- boost::asio::placeholders::error));
- }
- private:
- boost::asio::io_context& io_context_;
- tcp::acceptor acceptor_;
- };
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc != 2)
- {
- std::cerr << "Usage: reference_counted <port>\n";
- return 1;
- }
- boost::asio::io_context io_context;
- using namespace std; // For atoi.
- server s(io_context, atoi(argv[1]));
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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