multithreading - How to create a subclass of thread Class properly in C++(subclass of std::thread) -

i trying create class parallel subclass of std::thread,therefore class defined in parallel.h,but main method defined in separate file main.cpp in same project(in visual studio).when create instance of parallel , execute join() function in main() method below code segment: new c++, here "parallel.h"-

#include<thread> using namespace std; namespace para{ class parallel:thread { public:      static void run(){      }     parallel(void)     {     }      virtual ~parallel(void)     {     }      inline static void start(parallel* p){                 // (*p).join();     }      virtual void parallel::start(thread& t){      }     static void parallelize(parallel& p1,parallel& p2){      }     inline virtual parallel* operator=(thread* t){         return  static_cast<parallel*>(t);     } } 

//in main.cpp

void main(){      parallel p;     p.join();     thread t(print);      t.join();      system("pause");  } 

problem how define proper subclass of thread class having overloaded constructor taking function name parameter,also when defined p.join() compiler given following errors in vs2012:

error 2 error c2247: 'std::thread::join' not accessible because 'para::parallel' uses 'private' inherit 'std::thread' c:\users\gamer\desktop\projecq\vc++@omaq\cq47\cq47\main.cpp 11

3 intellisense: function "std::thread::join" (declared @ line 209 of "h:\program files (x86)\microsoft visual studio 11.0\vc\include\thread") inaccessible c:\users\gamer\desktop\projecq\vc++@omaq\cq47\cq47\main.cpp 11

the error "uses 'private' inherit" when try call 'p.join()' because have written:

    class parallel:thread 

when should have written:

    class parallel : public thread 

the default private inheritance, means methods of base class become private on inheriting class. have specify inheritance should public if want them accessible.