/samefile say P.cpp
// in somefunction
void send_msg( bla .. bla ..)
{
bla ..bla...
if( client_mine ) //
{

std::cout <<" We are in client_mine stmt "  // this statement always get printed even just before crashing
    try
   {
        Answer_thread answer_thread( *client_mine );
        bla ..
        bla..
        bla,,
   }
   catch(...)
  {
    std::cout << " Never get caught here " ;
   }
}
}
//in same file
 class Answer_thread
    {
    public:

       Answer_thread( Client_Mine& client_mine )
        :   client_mine_( client )
        ,   thread_( boost::ref( *this ) )
        ,   sleep_int_( 2250 )
        {
           std::cout <<" When application crashes .. i never get printed out " ;
        }

    private:
        Client_Mine& client_mine_;
        boost::thread thread_;
        string answer_;
        int sleep_int_;
};