#include <iostream>
using namespace std;
 
class Integer
{
private:
    int value;
public:
    Integer(int i): value(i) 
    {}
    const Integer operator+(const Integer& rv) const {
        return (value + rv.value);
    }
 
    void constMethod() const {
    	cout << "const\n";
    }
 
    void nonConstMethod() {
    	cout << "non-const\n";
    }
 
};
 
int main() {
 
	Integer a{1};
	Integer b{2};
 
	(a + b).constMethod();
	//(a + b).nonConstMethod();
 
	return 0;
}
 

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