Question

class Foo
{
public:
    int fn()
    {
        return 1;
    }
    int fn(int i)
    {
        return i;   //2nd fn()
    }
};
class Bar:Foo
{
public :
    Foo::fn;
};
int main(int argc, char** argv)
{
    Bar b;
    cout<<b.fn(2)<<endl;
}

is to possible to hide fn(int) in the concrete class “Bar”

Answer 1

AFAIK no, you cannot ‘hide’ names from namespaces. This related to names, so that includes all possible overloads of the same name.

Similarly, there is no way to unusing a name/namespace.

This very phenomenon leads to the rather little-known ADL Pitfall that library writers should always be aware of.

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PS. in the sample code, of course you could just drop the line saying /*using*/ Foo::fn; line… but I guess that is not your actual code….