Sorting for equal_range()

[gulHK]

Thanks LaserLight, please have a look at the code and please let me know if I can write this "bool operator<(const MyPred& p) const" overloaded method out side of struct, actually that's what I need, the overloaded operator consists of variables that should have the same values in order for any two elements of the vector to be considered equal and is it possible to write more than one comparison method with different comparison criteria? This struct with overloaded method works fine with equal_range() and it does find duplicate elements in the vector

struct MyPred
{
	std::string x;
	std::string y;

	MyPred(const std::string& x, const std::string& y): x(x), y(y) {}

	bool operator==(const MyPred& p) const
	{
		return x == p.x && y == p.y;
	}
        
        // variables with same values are compared here OR found out here
	bool operator<(const MyPred& p) const
	{
		if(x < p.x) return true;
		if(x > p.x) return false;
		if(y < p.y) return true;
		if(y > p.y) return false;
		return false;
	}
};