C++ Initialize Class based global variables -

i trying define few global variables should available functions initialize main program. can me syntax? please note still bit beginner c++ classes etc. need run same copy of program multiple times , don't want have same shared class across multiple instances of program - need ensure create new class in main body. wanted mention - printvars - pre-built function me , don't have control on passing pointer variables - can use global variables in function.

class gvars {    public:    int x=0;    int y=0;    gvars() {}    ~gvars() {} };  std::unique_ptr<gvars> *g=null;  // must pointer class  //i can't pass parameters function //only have control on body of program access global vars void printvars() {    std::cout << (*g).x << " " << (*g).y << std::endl; }  int main() {    if (g==null)   {      g=new gvars();  // critical  - create new class here   }    (*g).x=10;   (*g).y=20;    printvars();  // expected output :  10   20    delete g;    return 0; } 

code except line. try change

std::unique_ptr<gvars> *g=null;  // must pointer class 

to

gvars*g=null; 

program create/delete new instance of class on each run sure. printvars should work fine.