Methods with non-type template parameters

Question

I was wondering what the proper syntax to create non-type templated class methods. I've tried this, but apparently it does not work:

class A
{
    enum B
    {
        C = 0,
        D
    };
    template <A::B value = A::C>
    int fun();
};

template<A::B value>
int A::fun<A::B::C>()
{
    return 1;
}

template<A::B value>
int A::fun<A::B::D>()
{
    return fun<B>() + 1;
}

What am I doing wrong?

Answer 1

You are attempting to partially specialize function templates, which is not allowed. Here is a compilable snippet:

class A
{
    enum B
    {
        C = 0,
        D
    };
    template <A::B value = A::C>
    int fun();
};

template<>
int A::fun<A::B::C>()
{
    return 1;
}

template<>
int A::fun<A::B::D>()
{
    return fun<B::C>() + 1;
}