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#include <iostream>
using namespace std;
 
template <class T, typename comp>
struct klasa {
	comp komparator;
    klasa(const T &a, const T &b, comp C = greater<T>()) : komparator(C) 
    {
        cout << C(a, b) << endl;
    }
};
 
struct MyCompare
{
    bool operator()(const int& a, const int& b) { return true; }
};
 
bool fPtr(const int& a, const int& b) { return false; }
 
int main() 
{
    klasa<int, greater<int>> a(1, 2);
    klasa<int, MyCompare> b(5, 2, MyCompare());
 
    auto lessThan = [](const int& a, const int& b) { return a < b; };
    klasa<int, decltype(lessThan)> c(1, 5, lessThan);
 
    klasa<int, decltype(fPtr)> d(0, 0, fPtr);
 
    return 0;
}

prog.cpp: In instantiation of ‘struct klasa<int, bool(const int&, const int&)>’:
prog.cpp:28:33:   required from here
prog.cpp:6:7: error: field ‘klasa<int, bool(const int&, const int&)>::komparator’ invalidly declared function type
  comp komparator;
       ^

Standard output is empty