c++ - Boost shared_ptr object having problems with getting values -

ok... i've spent time 1 this.

what doing making list of connections, "strangers" unconfirmed, or denied connection waits ack make sure client got message. host has vector of these strangers boost::shared_ptr, , when stranger accepted, , acked, becomes client, thats not problem.

when connection received, new stranger made, runtime error when calling endpoint "(*it)->getendpoint()" inside of sending packet, that's example, same other values, "timed_out".

down here stranger class, , usage of sending

class stranger : public boost::enable_shared_from_this<stranger> //a short lived object sends reply if connection accepted / denied until ack received or timed out. { private:   udp::endpoint end_p_;   std::string data_;   std::string name_;    deadline_timer timeout; public:    bool accepted = false; //public check if stranger accepted or not.    bool timed_out = false;    //we assume packet sending accepting connection because have name parameter.   stranger(udp::endpoint end_p, std::string name, boost::asio::io_service &io_s)     :timeout(io_s)     ,end_p_(end_p)   {     std::stringstream ss; //formatting packet     ss<<(char)(con_rep_accepted)<<0<<0; //packettype, 2 bytes pak num(its 0 because connection)     data_ = ss.str();     name = name_;     accepted = true;     timed_out = false;      timeout.expires_from_now(boost::posix_time::seconds(5));     timeout.async_wait(boost::bind(&stranger::dotimeout, this));   }   //we assume packet sending denying connection because there no name.   stranger(udp::endpoint end_p , boost::asio::io_service& io_s)     :timeout(io_s)   {     end_p_ = end_p;     std::stringstream ss; //formatting packet     ss<<(char)(con_rep_denied)<<0<<0; //1 byte packet type, 2 bytes pak num(its 0 because connection)     data_ = ss.str();     accepted = false;     timed_out = false;      timeout.expires_from_now(boost::posix_time::seconds(5));     timeout.async_wait(boost::bind(&stranger::dotimeout, this));   }    void dotimeout()   {     std::cout<<"timed.\n";     timed_out = true;   }     udp::endpoint getendpoint(){return end_p_;} //to compare endpoints    std::string getdata(){return data_;}    std::string getname(){return name_;}    ~stranger(){timeout.cancel();} }; 

where debugger points when runtime. client same stranger right now, no game data send. vector of shared_ptrs.

//everything server receives void host_state::receive() { socket_.async_receive_from(   boost::asio::buffer(in_data,1024), sender_endpoint_,   [this](boost::system::error_code ec, std::size_t bytes)   {     if (!ec && bytes >= 3 ) //the header 3 bytes, , smallest usable packet 3 bytes.     {        int pak_type = (int)(in_data[0]);        unsigned short packet_num = (in_data[1] << 8) | in_data[2]; //the number in order        for(auto = clients.begin(); it!=clients.end(); it++)         //here!------------------------         if((*it)->getendpoint() == sender_endpoint_) //<-debugger points here         //------------------------         { 

using windows, gcc 4.8.1, boost 1.57.0. debug dump:

#0 00435e5c boost::shared_ptr<client>::operator->(this=0x6e6f6974) (c:/boost_1_57_0/boost/smart_ptr/shared_ptr.hpp:648) #1 00406394 host_state::__lambda1::operator() (__closure=0x28fc00, ec=..., bytes=67) (c:\users\poteto\desktop\pixely_trenches\sources\server.cpp:26) #2 00408eb1 boost::asio::detail::binder2<host_state::receive()::__lambda1, boost::system::error_code, unsigned int>::operator()(void)(this=0x28fc00) (c:/boost_1_57_0/boost/asio/detail/bind_handler.hpp:127) #3 00408e61 boost::asio::asio_handler_invoke<boost::asio::detail::binder2<host_state::receive()::__lambda1, boost::system::error_code, unsigned int> >(boost::asio::detail::binder2<host_state::receive()::__lambda1, boost::system::error_code, unsigned int> &, ...)(function=...) (c:/boost_1_57_0/boost/asio/handler_invoke_hook.hpp:69) #4 00408d55 boost_asio_handler_invoke_helpers::invoke<boost::asio::detail::binder2<host_state::receive()::__lambda1, boost::system::error_code, unsigned int>, host_state::receive()::__lambda1>(boost::asio::detail::binder2<host_state::receive()::__lambda1, boost::system::error_code, unsigned int> &, host_state::__lambda1 &)(function=..., context=...) (c:/boost_1_57_0/boost/asio/detail/handler_invoke_helpers.hpp:37) #5 00408993 boost::asio::detail::win_iocp_socket_recvfrom_op<boost::asio::mutable_buffers_1, boost::asio::ip::basic_endpoint<boost::asio::ip::udp>, host_state::receive()::__lambda1>::do_complete(boost::asio::detail::io_service_impl *, boost::asio::detail::operation *, const boost::system::error_code &, std::size_t)(owner=0x9cff48, base=0x9c3510, result_ec=..., bytes_transferred=67) (c:/boost_1_57_0/boost/asio/detail/win_iocp_socket_recvfrom_op.hpp:104) #6 00423cd0 boost::asio::detail::win_iocp_operation::complete(this=0x9c3510, owner=..., ec=..., bytes_transferred=67) (c:/boost_1_57_0/boost/asio/detail/win_iocp_operation.hpp:46) #7 00424df5 boost::asio::detail::win_iocp_io_service::do_one(this=0x9cff48, block=true, ec=...) (c:/boost_1_57_0/boost/asio/detail/impl/win_iocp_io_service.ipp:405) #8 00424aa1 boost::asio::detail::win_iocp_io_service::run(this=0x9cff48, ec=...) (c:/boost_1_57_0/boost/asio/detail/impl/win_iocp_io_service.ipp:164) #9 0041e65a boost::asio::io_service::run(this=0x511391c) (c:/boost_1_57_0/boost/asio/impl/io_service.ipp:59) #10 0041645e    _fu15___zst4cout() (c:/users/poteto/desktop/pixely_trenches/sources/host.h:232) #11 00405a87    changestate() (c:\users\poteto\desktop\pixely_trenches\sources\main.cpp:44) #12 00405c90    sdl_main(argc=argc@entry=1, argv=argv@entry=0x3b0008) (c:\users\poteto\desktop\pixely_trenches\sources\main.cpp:98) #13 0040c11c    console_main(argc=argc@entry=1, argv=argv@entry=0x3b0008) (../src/main/windows/sdl_windows_main.c:140) #14 0040c2dd    winmain@16(hinst=0x400000, hprev=0x0, szcmdline=0x9d3ab4 "", sw=10) (../src/main/windows/sdl_windows_main.c:177) #15 00448c1b    main () (??:??) 

when queue async activity, want use shared_ptr in bind object's life extended long there outstanding activities.

your problem in usage of boost::bind.

for example:

timeout.async_wait(boost::bind(&stranger::dotimeout, shared_from_this())); 

is proper pattern.