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#include <iostream>
using namespace std;
 
template <class F>
void funkcja (F &&comp) { }
 
 
 
template <class T, class F>
class priority_queue {
private:
    F &&comp;
 
public:
    priority_queue (F &&_comp) : comp(_comp) { }
};
 
bool gr (int a, int b) { return true; }
 
int main() {
	priority_queue <int> a(gr);
	// funkcja(gr); // to dziala bez problemu
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:21:21: error: wrong number of template arguments (1, should be 2)
  priority_queue <int> a(gr);
                     ^
prog.cpp:10:7: error: provided for ‘template<class T, class F> class priority_queue’
 class priority_queue {
       ^
prog.cpp:21:24: error: invalid type in declaration before ‘(’ token
  priority_queue <int> a(gr);
                        ^
prog.cpp:21:27: error: invalid conversion from ‘bool (*)(int, int)’ to ‘int’ [-fpermissive]
  priority_queue <int> a(gr);
                           ^
prog.cpp:21:23: warning: unused variable ‘a’ [-Wunused-variable]
  priority_queue <int> a(gr);
                       ^

Standard output is empty