#include <vector>
#include <set>
 
#include <algorithm>
#include <functional>
 
struct point // A simple custom point structure
{
    int x, y;
};
 
// Functor created by the wizard
// --------------------------------------------------
 
struct point_functor
	: public std::binary_function<point, point, bool>
{
	bool operator() (const point &left, const point &right) const
	{
		if (left.x == right.x)
			return (left.y < right.y);
		else
			return (left.x < right.x);
	}
};
 
// --------------------------------------------------
 
int main()
{
	std::vector<point> v;
	std::sort(v.begin(), v.end(), point_functor()); //Compiles happily with point structures
 
	std::set<point, point_functor> s;
	s.find(point()); //Compiles happily with point structures
 
	return 0;
}

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