Question

I have the following code using Boost ASIO to setup a TCP client. Here is my code adapted from the Boost doc’s chat example.

class AsioCommunicationService {
AsioCommunicationService::AsioCommunicationService(
        boost::asio::io_service& io_service,
        tcp::resolver::iterator endpoint_iterator)
    : io_service_(io_service),
      socket_(io_service)
{
    tcp::endpoint endpoint = *endpoint_iterator;
    socket_.async_connect(endpoint,
    boost::bind(&AsioCommunicationService::handle_connect, this,
    boost::asio::placeholders::error, ++endpoint_iterator));
}

void AsioCommunicationService::handle_connect(const boost::system::error_code& error,
        tcp::resolver::iterator endpoint_iterator)
{
    if (!error)
    {
      boost::asio::async_read(socket_,
          boost::asio::buffer(read_msg_.data(), LampMessage::header_length),
          boost::bind(&AsioCommunicationService::handle_read_header, this,
          boost::asio::placeholders::error));
    }
}
}


class Connection
{
    //init io_service, query, resolve, iterator here
    boost::asio::io_service io_service;
    boost::asio::ip::tcp::resolver resolver(io_service);
    boost::asio::ip::tcp::resolver::query query(host, service);
    boost::asio::ip::tcp::resolver::iterator endpoint_iterator =
  resolver.resolve(query);


    m_session = std::shared_ptr<AsioCommunicationService>(
            new AsioCommunicationService(io_service, iterator));

    //start new thread for io_service.run --> GOT AN ERROR when include boost/thread.hpp
    boost::thread t(boost::bind(&boost::asio::io_service::run, &io_service));

    //this synchronous command would work, but it's blocking the program. I don't want that.
    //io_service.run();
}

Of course, I needed to include boost/thread to make the declaration to variable t in class Connection works. But when I did so, I got this error

#include <boost/thread.hpp>
//ERROR: In function ‘boost::thread&& boost::move(boost::thread&&)’:
///usr/include/boost/thread/detail/thread.hpp:349:16: error: invalid initialization of reference of type ‘boost::thread&&’ from expression of type ‘boost::thread’
//In file included from /usr/include/boost/thread/detail/thread_heap_alloc.hpp:17:0,
//             from /usr/include/boost/thread/detail/thread.hpp:13,
//             from /usr/include/boost/thread/thread.hpp:22,
//             from /usr/include/boost/thread.hpp:13,
//             from /home/son/dev/logistics/src/frameworks/networkService/NetworkConnection.cpp:13:
///usr/include/boost/thread/pthread/thread_heap_alloc.hpp: In function ‘T* boost::detail::heap_new(A1&&) [with T = boost::detail::thread_data<void (*)()>, A1 = void (*&)()]’:
///usr/include/boost/thread/detail/thread.hpp:130:95:   instantiated from here
///usr/include/boost/thread/pthread/thread_heap_alloc.hpp:24:47: error: cannot bind ‘void (*)()’ lvalue to ‘void (*&&)()’
///usr/include/boost/thread/detail/thread.hpp:43:13: error:   initializing argument 1 of ‘boost::detail::thread_data<F>::thread_data(F&&) [with F = void (*)()]’

It would compile and work if I remove the include to boost/thread.hpp, and replace the declaration to t by a simple call to io_service.run(); I’m wondering if this compilation error has to do with boost version. I’m using Boost ASIO 1.42, Ubuntu 11.04 and Eclipse if those are of any help. Thank you in advance.

Answer 1

After much exploration, following @MvG suggestion, I successfully compiled and linked my simple program by doing the following:

• manually build and install boost 1.50 (using MvG suggestion)
• compile and link the source using the following 2 make files (1 for static and 1 for dynamic linking).

Dynamic:

default: test

test.o: test.cpp
    g++-4.5 -std=c++0x -I /home/son/boost_1_50/include/ -c test.cpp 

test: test.o        
    g++-4.5 -std=c++0x -L /home/son/boost_1_50/lib/ test.o -lboost_thread -lboost_system -lboost_chrono -pthread -o test

run: test
    LD_LIBRARY_PATH=/home/son/boost_1_50/lib/ ./test

Static:

default: test

test.o: test.cpp
    g++-4.5 -std=c++0x -I /home/son/boost_1_50/include/ -c test.cpp 

test: test.o
    g++-4.5 -std=c++0x -L /home/son/boost_1_50/lib/ test.o -static -lboost_thread -lboost_system -lboost_chrono -pthread -o test

run: test
    ./test

The test.cpp file is as follows.

#include <boost/thread.hpp>
#include <stdio.h>

int main()
{
    printf("boost thread tested by son\n");
    boost::thread t;
    return 0;
}

That’s it. I’m having difficulties compiling this with CMake but that’s another problem.