Pure virtual functions in C++11

Question

In C++98, the null pointer was represented by the literal 0 (or in fact any constant expression whose value was zero). In C++11, we prefer nullptr

Answer 1

The = 0 notation for virtual functions wasn't literally "assign null" but rather a special notation which is actually deceptive: a pure virtual function can also be implemented.

With various context keywords it would make more sense to allow abstract rather than = nullptr and have abstract be a context keyword.