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boost::shared_ptr does not have a class type

March 13Hits:1

I have implemented a tcp client and tcp server using boost asio. The code is given below. (test.cpp, test.hpp and makefile)

The executable can be run as

(server side)

$ ./client_server 1 5005 

(client side)

$ ./client_server 0 5005 

tcp_sever uses a holder class tcp_connection for each clients that connects to the server.I have added a std::vector of type inside tcp_connection class (added in the code below).

std::vector<pointer> m_subscribers; 

I want to populate this vector either inside static pointer create(boost::asio::io_service& io_service); of class tcp_connection

OR inside

tcp_server::start_accept() after the connection has been created.

To access the private member variable m_subscribers from tcp_server I need to implement an accessor function.

std::vector<tcp_connection::pointer> &tcp_connection::get_subscriber_list() {       return m_subscribers; } 

and inside tcp_server::start_accept I do


I get the error error: ‘new_connection.boost::shared_ptr<T>::operator-><tcp_connection>()->tcp_connection::get_subscriber_list’ does not have class type


#include "test.hpp" #include <iostream> #include <exception> #include <boost/array.hpp> #include <boost/asio.hpp> #include <boost/shared_ptr.hpp> #include <boost/enable_shared_from_this.hpp> #include <boost/asio.hpp> #include <boost/bind.hpp> #include <algorithm> #include <sstream> #include <iomanip>  const int ARG_COUNT = 2; const int MAX_PACKETS = 25; const int LOWEST_PORT = 1024; const int HIGHEST_PORT = 65000;  static char message_array[8192];  void gen_random_string(char *s, const int len) {     static const char alphanum[] =         "0123456789"         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"         "abcdefghijklmnopqrstuvwxyz";      for (int i = 0; i < len; ++i) {         s[i] = alphanum[rand() % (sizeof(alphanum) - 1)];     }     s[len] = 0; }  class tcp_connection :public boost::enable_shared_from_this<tcp_connection> { public:     typedef boost::shared_ptr<tcp_connection> pointer;      static pointer create(boost::asio::io_service& io_service)     {         return pointer(new tcp_connection(io_service));     }      boost::asio::ip::tcp::tcp::socket& socket()     {         return socket_;     }      void start()     {         gen_random_string(message_array, 8192);         std::string message(message_array);          boost::asio::async_write(socket_, boost::asio::buffer(message),                                  boost::bind(&tcp_connection::handle_write, shared_from_this(),                                              boost::asio::placeholders::error,                                              boost::asio::placeholders::bytes_transferred));     }  private:     tcp_connection(boost::asio::io_service& io_service)         : socket_(io_service)     {     }      void handle_write(const boost::system::error_code& /*error*/,                       size_t /*bytes_transferred*/)     {     }      boost::asio::ip::tcp::socket socket_;     std::vector<pointer> m_subscribe;     std::string message; };  class tcp_server { public:     tcp_server(boost::asio::io_service& io_service,int port_number)         : acceptor_(io_service, boost::asio::ip::tcp::tcp::endpoint(boost::asio::ip::tcp::tcp::v4(), port_number))     {         std::cout << "TCP server listening on " << port_number << std::endl;         start_accept();     }  private:     void start_accept()     {         tcp_connection::pointer new_connection =             tcp_connection::create(acceptor_.get_io_service());          acceptor_.async_accept(new_connection->socket(),                                boost::bind(&tcp_server::handle_accept, this, new_connection,                                            boost::asio::placeholders::error));     }      void handle_accept(tcp_connection::pointer new_connection,                        const boost::system::error_code& error)     {         if (!error)         {             new_connection->start();             start_accept();         }     }      boost::asio::ip::tcp::tcp::acceptor acceptor_; };   void runTCPServer ( CmdLineOpts input ) {     try     {         boost::asio::io_service io_service;         tcp_server server(io_service,input.port);         io_service.run();     }     catch (std::exception& e)     {         std::cerr << e.what() << std::endl;     } }  class tcp_client { public:     tcp_client(         boost::asio::io_service& io_service,         const std::string& host,         const std::string& port     ) : io_service_(io_service), socket_(io_service, boost::asio::ip::tcp::tcp::endpoint(boost::asio::ip::tcp::tcp::v4(), 0))     {         boost::asio::ip::tcp::tcp::resolver resolver(io_service_);         boost::asio::ip::tcp::tcp::resolver::query query(boost::asio::ip::tcp::tcp::v4(), host, port);         boost::asio::ip::tcp::tcp::resolver::iterator iter = resolver.resolve(query);         endpoint_ = *iter;         boost::asio::connect(socket_, iter);     }      ~tcp_client()     {         socket_.close();     }       void recieve_from() {         /*Initialize our endpoint*/         size_t len = socket_.read_some(                          boost::asio::buffer(recv_buf), error);          if (error == boost::asio::error::eof)             std::cout << "Connction close cleanly by peer" << std::cout;         else if (error)             throw boost::system::system_error(error); // Some other error.          std::cout.write(recv_buf.data(), len) << std::endl;      }  private:     boost::asio::io_service& io_service_;     boost::asio::ip::tcp::tcp::socket socket_;     boost::asio::ip::tcp::tcp::endpoint endpoint_;     boost::array<char, 2048> recv_buf;     boost::asio::ip::tcp::endpoint sender_endpoint;     boost::system::error_code error;  };  void runTCPClient(std::string portStr) {     try     {         boost::asio::io_service io_service;         tcp_client client(io_service, "localhost", portStr);         client.recieve_from();     }     catch (std::exception& e)     {         std::cerr << e.what() << std::endl;     }  }  void runClient( CmdLineOpts input ) {     runTCPClient(input.portStr);  }  void runServer( CmdLineOpts input ) {     runTCPServer(input); }  /**  * * Usage: client_server <protocol> <port> <num of packets>  * */ bool cmdline_parse ( int argc, char *argv[], CmdLineOpts *input ) {     bool result = true;     if (argc - 1 == ARG_COUNT)     {         // arg 1: server or client         int arg1 = std::stoi(argv[1]);         if (arg1 == 0 || arg1 == 1)         {             input->servOrClient = arg1;         }         else         {             std::cout << "Invalid client server choice.\nUsage: client_server <client (0) or server(1)> <protocol> <port>" << std::endl;             result = false;         }         // arg 3: port         int arg2 = std::stoi(argv[2]);         if (arg2 > LOWEST_PORT && arg2 < HIGHEST_PORT )         {             input->port = arg2;             input->portStr = argv[2];         }         else         {             std::cout << "Invalid port, must be between " << LOWEST_PORT << " and " << HIGHEST_PORT << std::endl;             std::cout << "Usage: client_server <client (0) or server(1)> <protocol> <port>" << std::endl;             result = false;         }      }     else     {         std::cout << "Usage: client_server <client (0) or server(1)> <protocol> <port>" << std::endl;         result = false;     }      return result; }    int main ( int argc, char *argv[] ) {     CmdLineOpts input;     if (cmdline_parse(argc, argv, &input))     {         if(input.servOrClient == 1)         {             runServer(input);         }         else if(input.servOrClient == 0)         {             runClient(input);         }     }     else     {         return 1;     }      return 0; } 


#ifndef CLIENT_SERVER_H_INCLUDED                                                                                                                                                                                    #define CLIENT_SERVER_H_INCLUDED  #include <string>  struct CmdLineOpts {     std::string portStr;     int port;     int servOrClient; };  void runTCPServer ( CmdLineOpts input );  void runTCPClient ( std::string port_str);  bool cmdline_parse ( int argc, char *argv[], CmdLineOpts input ); #endif 


TARGET = client_server                                                                                                                                                                                              LIBS = -lboost_system -lpthread CXX = g++  CXXFLAGS = -std=c++11 -g -Wall -pedantic  .PHONY: default all clean  default: $(TARGET) all: default  OBJECTS = $(patsubst %.cpp, %.o, $(wildcard *.cpp)) HEADERS = $(wildcard *.hpp)  %.o: %.cpp $(HEADERS)   $(CXX) $(CXXFLAGS) -c $< -o [email protected]  .PRECIOUS: $(TARGET) $(OBJECTS)  $(TARGET): $(OBJECTS)   $(CXX) $(OBJECTS) $(LIBS) -o [email protected]  clean:       -rm -f *.o       -rm -f $(TARGET) 
Tags:c++11, boost

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