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template<class T>
class IBase
{
public:
    virtual T Method() = 0;
};
 
class Derived : public IBase<int>, public IBase<char> {
public:
    int _value;
 
    virtual int IBase<int>::Method();
    virtual char IBase<char>::Method();
};
 
int Derived::Method() {
    return _value;
}
 
char Derived::Method() {
    return _value;
}
 
int main() {}

prog.cpp:12:36: error: cannot declare member function ‘IBase<int>::Method’ within ‘Derived’
     virtual int IBase<int>::Method();
                                    ^
prog.cpp:13:38: error: cannot declare member function ‘IBase<char>::Method’ within ‘Derived’
     virtual char IBase<char>::Method();
                                      ^
prog.cpp:16:21: error: no ‘int Derived::Method()’ member function declared in class ‘Derived’
 int Derived::Method() {
                     ^
prog.cpp:20:22: error: no ‘char Derived::Method()’ member function declared in class ‘Derived’
 char Derived::Method() {
                      ^

Standard output is empty