Re: polymorphic method override

Why does this code not compile?

#include<iostream>

using namespace std;

class A {
    public:
        virtual void myMethod(const string& s) const;
};

class B : public A {
    public:
        virtual void myMethod(int x) const;
};

void A::myMethod(const string& s) const {
    cerr<< "(A) myMethod: s is: "<< s<< endl;
}
void B::myMethod(int x) const {
    cerr<< "(B) myMethod: x = "<< x<< endl;
}

int main() {
    std::string s("my string one");
    B b;
    b.myMethod(s);
    return 0;
}

The error is:

$ g++ -Wall ./test-5.cpp -o test-5.out ./test-5.cpp: In function
???int main()???:
./test-5.cpp:25: error: no matching function for call to
???B::myMethod(std::string&)???
./test-5.cpp:18: note: candidates are: virtual void B::myMethod(int)
const