问题
I tried to turn this boost-asio server into a class and I got this one error trying to compile it,
C:\Documents and Settings\tcpip_server\TCPIP_server.h||In member function 'void TCPIP_server::server(boost::asio::io_service&, short int)':|
C:\Documents and Settings\tcpip_server\TCPIP_server.h|56|error: no matching function for call to 'bind(<unresolved overloaded function type>, boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >&)'|
c:\program files\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.4.1\..\..\..\..\include\boost\bind\bind.hpp|1472|note: candidates are: boost::_bi::bind_t<boost::_bi::unspecified, F, typename boost::_bi::list_av_1<A1>::type> boost::bind(F, A1) [with F = void (TCPIP_server::*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), A1 = boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >]|
c:\program files\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.4.1\..\..\..\..\include\boost\bind\bind.hpp|1728|note: boost::_bi::bind_t<typename boost::_bi::dm_result<M T::*, A1>::type, boost::_mfi::dm<M, T>, typename boost::_bi::list_av_1<A1>::type> boost::bind(M T::*, A1) [with A1 = boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >, M = void(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), T = TCPIP_server]|
||=== Build finished: 1 errors, 3 warnings ===|
I know I'm supposed to somehow cast the type for the session
function but there is no ambiguity since only one void
function exists. I did check this thread but I'm still confused by the error. Heres the code.
main.cpp
#include "TCPIP_server.h"
int main()
{
return 0;
}
TCPIP_server.h
#include <boost/thread/thread.hpp>
#include <boost/bind.hpp>
#include <boost/smart_ptr.hpp>
#include <boost/asio.hpp>
#include <cstdlib>
#include <iostream>
using boost::asio::ip::tcp;
const int max_length = 1024;
class TCPIP_server
{
private:
typedef boost::shared_ptr<tcp::socket> socket_ptr;
char data[max_length];
public:
TCPIP_server(){}
~TCPIP_server(){}
void session(socket_ptr sock)
{
try
{
for (;;)
{
char data[max_length];
boost::system::error_code error;
size_t length = sock->read_some(boost::asio::buffer(data), error);
if (error == boost::asio::error::eof)
break; // Connection closed cleanly by peer.
else if (error)
throw boost::system::system_error(error); // Some other error.
boost::asio::write(*sock, boost::asio::buffer(data, length));
}
}
catch (std::exception& e)
{
std::cerr << "Exception in thread: " << e.what() << "\n";
}
}
void server(boost::asio::io_service& io_service, short port)
{
tcp::acceptor a(io_service, tcp::endpoint(tcp::v4(), port));
for (;;)
{
socket_ptr sock(new tcp::socket(io_service));
a.accept(*sock);
boost::thread t(boost::bind(session, sock));
}
}
void main_server()
{
try
{
std::cerr << "Usage: blocking_tcp_echo_server \n";
boost::asio::io_service io_service;
using namespace std; // For atoi.
server(io_service, atoi("4001"));
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
}
};
回答1:
The bind
needs the TCPIP_server
's class instance on which to call the session
method. So your code should be:
boost::bind(&TCPIP_server::session, this, sock)
The TCPIP_server::
is mandatory to be fully C++03 compatible on all platforms/compilers.
来源:https://stackoverflow.com/questions/15697082/cboost-bind-error-no-matching-function-for-call-to-bindunresolved-overloa