moved asio folder and tested catkin-isolated build

asio/src/examples/cpp03/buffers/reference_counted.cpp

@@ -0,0 +1,131 @@
+//
+// reference_counted.cpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 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 <asio.hpp>
+#include <boost/bind/bind.hpp>
+#include <boost/enable_shared_from_this.hpp>
+#include <boost/shared_ptr.hpp>
+#include <iostream>
+#include <vector>
+
+using 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_(asio::buffer(*data_))
+  {
+  }
+
+  // Implement the ConstBufferSequence requirements.
+  typedef asio::const_buffer value_type;
+  typedef const asio::const_buffer* const_iterator;
+  const asio::const_buffer* begin() const { return &buffer_; }
+  const asio::const_buffer* end() const { return &buffer_ + 1; }
+
+private:
+  boost::shared_ptr<std::vector<char> > data_;
+  asio::const_buffer buffer_;
+};
+
+class session
+  : public boost::enable_shared_from_this<session>
+{
+public:
+  session(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));
+    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(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,
+          asio::placeholders::error));
+  }
+
+  void handle_accept(session_ptr new_session,
+      const asio::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,
+          asio::placeholders::error));
+  }
+
+private:
+  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;
+    }
+
+    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;
+}