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#include <iostream>
using namespace std;
 
template <class T, class F = decltype(greater<T>())>
class priority_queue {
private:
    F comp;
 
public:
    priority_queue (F _comp) : comp(_comp) { }
};
 
bool smaller(int a, int b) { return a < b; }
 
int main () {
   // priority_queue<int> PA(); // dziala
    priority_queue<int, decltype(smaller)> PB(smaller);
 
    auto lessThan = [](const int& a, const int& b) { return a < b; };
//	priority_queue<int, decltype(lessThan)> PC(lessThan); // dziala
 
    return 0;
}

prog.cpp: In instantiation of 'class priority_queue<int, bool(int, int)>':
prog.cpp:17:54:   required from here
prog.cpp:7:7: error: field 'priority_queue<int, bool(int, int)>::comp' invalidly declared function type
     F comp;
       ^

Standard output is empty