Using an enumeration as a template parameter

Question

I would like to use a template class to provide some common functionality to some child classes that are very similar. The only variation is the enumeration that each uses.

Answer 1

Enumerations can be template parameters in exactly the same way that ints can.

enum Enum { ALPHA, BETA };

template  class Foo {
    // ...
};

template <> void Foo  :: foo () {
    // specialise
}

class Bar : public Foo  {
    // OK
}

But you simply haven't provided a definition for E_EnumerationBase::E_EnumerationBase()

This isn't a problem with templates or inheritence. It's the same as if you written this:

struct Foo {
    Foo ();
}
int main () {
    Foo foo;
}