Question

I’m just toying around to watch how defining operators work. The following code gives me an error about “No candidate functions found”.

Any criticism other than that of the root cause is welcome, too. Thanks!

#include <iostream>

using std::cout; using std::cin; using std::endl;

using std::string;

class SomeClass {
public:
    SomeClass(int newNum, string newString) { num=newNum; str = newString; }

    SomeClass& operator=(const SomeClass& rh) {
        string newVal(rh.getStr());
        str = newVal;
    }

    void setStr(string newString) { str = newString; }
    const string getStr() { return str; }
    string toString() { return str+str; }

private:
    string str;
    int num;
};

int main() {
    SomeClass a(5, "five");
    SomeClass b(3, "three");

    cout << a.toString() << endl << b.toString() << endl;

    a=b;

    cout << a.toString() << endl << b.toString() << endl;
}

Answer 1

const string getStr() { return str; }

should be

const string& getStr() const { return str; }

Otherwise you cannot call a non-const function on a const parameter of

SomeClass& operator=(const SomeClass& rh)