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#include <iostream>
#include <thread>
 
typedef double pcap_t;
typedef float device;
 
typedef void (*pcap_handler)(u_char *user, const struct pcap_pkthdr *h, const u_char *bytes);
 
int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user);
 
class monitor {
   public:
    monitor(device *dev);
    void exec();
    void end();
    virtual ~monitor();
 
   private:
    static pcap_handler process_packet(u_char *arg, const struct pcap_pkthdr* pkthdr,
                          const u_char * packet);
    static void thread_func(monitor *mon);
      device *dev;
        };
void monitor::exec() {
  std::thread t (monitor::thread_func, this);
}
 
void monitor::thread_func(monitor *mon) {
  pcap_loop(nullptr, -1, monitor::process_packet, reinterpret_cast<u_char*>(mon)); // error in this line
}
 
pcap_handler monitor::process_packet(u_char *arg, const struct pcap_pkthdr* pkthdr,
                             const u_char * packet) {
  monitor *mon = reinterpret_cast<monitor*>(arg);
}
 
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp: In static member function ‘static void monitor::thread_func(monitor*)’:
prog.cpp:29:81: error: invalid conversion from ‘void (* (*)(u_char*, const pcap_pkthdr*, const u_char*))(u_char*, const pcap_pkthdr*, const u_char*) {aka void (* (*)(unsigned char*, const pcap_pkthdr*, const unsigned char*))(unsigned char*, const pcap_pkthdr*, const unsigned char*)}’ to ‘pcap_handler {aka void (*)(unsigned char*, const pcap_pkthdr*, const unsigned char*)}’ [-fpermissive]
   pcap_loop(nullptr, -1, monitor::process_packet, reinterpret_cast<u_char*>(mon)); // error in this line
                                                                                 ^
prog.cpp:9:5: error:   initializing argument 3 of ‘int pcap_loop(pcap_t*, int, pcap_handler, u_char*)’ [-fpermissive]
 int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user);
     ^
prog.cpp: In static member function ‘static void (* monitor::process_packet(u_char*, const pcap_pkthdr*, const u_char*))(u_char*, const pcap_pkthdr*, const u_char*)’:
prog.cpp:34:12: warning: unused variable ‘mon’ [-Wunused-variable]
   monitor *mon = reinterpret_cast<monitor*>(arg);
            ^
prog.cpp:35:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

Standard output is empty