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#include <fstream>
#include <vector>
#include <list>
#include <math.h>
#include <iostream>
#include <memory>
using namespace std;
 
template <class T>
class Factory {
protected:
    int num;
public:
    Factory(int num) : num(num) {}
    virtual T * create() {
        return new T(num);
    }
};
 
class Integer {
    int num;
public:
    Integer(int num) : num(num) {}
};
 
class Pair {
    int num1, num2;
public:
    Pair(int num1, int num2) : num1(num1), num2(num2) {}
};
 
class ExtendedFactory : public Factory<Pair> {
protected:
    int num2;
public:
    ExtendedFactory(int num1, int num2) : Factory(num1), num2(num2) {}
    virtual Pair * create() {
        return new Pair(num, 24);
    }
};
 
int main()
{
    Factory<Integer> ints(42);
    ints.create();
    return 0;
}

prog.cpp: In instantiation of 'T* Factory<T>::create() [with T = Pair]':
prog.cpp:47:1:   required from here
prog.cpp:16:25: error: no matching function for call to 'Pair::Pair(int&)'
         return new T(num);
                         ^
prog.cpp:29:5: note: candidate: Pair::Pair(int, int)
     Pair(int num1, int num2) : num1(num1), num2(num2) {}
     ^
prog.cpp:29:5: note:   candidate expects 2 arguments, 1 provided
prog.cpp:26:7: note: candidate: constexpr Pair::Pair(const Pair&)
 class Pair {
       ^
prog.cpp:26:7: note:   no known conversion for argument 1 from 'int' to 'const Pair&'
prog.cpp:26:7: note: candidate: constexpr Pair::Pair(Pair&&)
prog.cpp:26:7: note:   no known conversion for argument 1 from 'int' to 'Pair&&'

Standard output is empty