priority queue - Using priority_queue in C++ -

i'm trying write simple function returns time wait car arrives @ gate of parking lot. i'm using priority_queue purpose , code doesn't seem compile.

here's function

std::time_t waitingtime(std::vector<car* > v){     //std::unordered_map<std::time_t, std::string> lookup;     std::vector<std::time_t> timevector;     std::priority_queue<std::time_t, timevector, std::greater<std::time_t>> q;      for(auto = v.begin(); != v.end(); it++){         car* c = *it;         timevector.push_back(c->exit);         //lookup[c->exit] = c->id;     }     for(std::time_t t :timevector){         q.push(t);     }      const std::time_t t = q.top();     q.pop();     return t; }; 

here's driver code

std::time_t = time(0);      car* c1 = new car("a", now+2, now+4);     car* c2 = new car("a", now, now+3);     car* c3 = new car("a", now, now+1);      std::vector<car* > v;     v.push_back(c1);     v.push_back(c2);     v.push_back(c3);      std::time_t t = waitingtime(v);     std::cout<<t<<std::endl; 

here's compilation error.

38: error: template argument template type parameter must type     std::priority_queue<std::time_t, timevector, std::greater<std::time_t>> q; 

you need provide types arguments template, not objects. declaration of queue should following:

std::priority_queue<std::time_t> queue; 

note, didn't specify other template arguments - default needed.