#include <algorithm>
#include <iostream>
 
class sig
{
public:
    sig()
    {
        struct Functor
        {
            Functor() : value(0) {};
            int operator ()() { return value++; };
            int value;
        };
        std::generate(p_list, p_list + 4, Functor());
    }
 
    int p_list[4];
};
 
int main(int argc, char **argv)
{
	sig a;
 
	for (int i = 0; i < 4; ++i)
	{
		std::cout << a.p_list[i] << ' ';
	}
 
	return 0;
}

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