C++ disappointment? Member functions adding parameters?

This seems like such a basic thing:

int foo(int local, int context);​

​

struct A​

{​

    int context;​

​

    int foo (int local)​

    {​

        //return foo (local, context);​ // would be nice, but not legal

        return ::foo (local, context);​ // workaround

    }​

};​

And then wrap it in a namespace:

​

namespace n1​

{​

​

int foo(int local, int context);​

​

struct A​

{​

    int context;​

​

    int foo (int local)​

    {​

        return ::foo (local, context);​ // no longer correct

    }​

};​

​

}​

it seems to me there are two principles violated here:

1. I shouldn't have to disambiguate in the first place. The lexical scopes should be merged. Too ambiguous?

2. If I have to disambiguate, code should not have to know what namespace it is in.

I should be able to wrap existing code in namespaces w/o breaking it.