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#include <iostream>
 
using namespace std;
 
#include <iostream>
using namespace std;
 
class MyClass
{
    string& Str;
 
    public:
    MyClass(string& str) : Str(str)
    {
 
    };
 
 
    void SetString(string& str)
    {
        Str = str;
    }
    string GetString() const
    {
        return Str;
    }
};
 
void fn(const MyClass& myClassInstance)
{
    string str2{"str2"};
    myClassInstance.SetString(str2);
}
 
int main() {
    string str{"str1"};
    MyClass myObj{str};
    cout << myObj.GetString() << endl;
    fn(myObj);
    cout << myObj.GetString() << endl;
    return 0;
}
 

prog.cpp: In function ‘void fn(const MyClass&)’:
prog.cpp:32:35: error: passing ‘const MyClass’ as ‘this’ argument discards qualifiers [-fpermissive]
     myClassInstance.SetString(str2);
                                   ^
prog.cpp:19:10: note:   in call to ‘void MyClass::SetString(std::__cxx11::string&)’
     void SetString(string& str)
          ^~~~~~~~~

Standard output is empty