const-overridden.cpp

#include <map>
#include <iostream>

struct range : std::pair<int, int> {
	using std::pair<int, int>::pair;
	
	void foo() const {
		left = 10;
	}
	
	int& left = first;
	int& right = second;
};

int main() {
	// your code goes here
	const range r{1, 2};
	std::cout << r.first << ' ' << r.second << std::endl;
	r.foo();
	std::cout << r.first << ' ' << r.second << std::endl;
	std::cout << sizeof r << std::endl;

	return 0;
}