Can I pass string literal for template parameter?

Hi

I'm gonna implement a dynamic type-cast mechanism. I need to give unique ID to all classes, and I think hash value calculated from the name of class would be appropriate.

What I'd like to do is something like this:

Code:

---

template <char const* const psz>
struct _hash_
{
        enum {
                value = *psz
                        ? (_hash_<psz+1>::value << 2) | *psz
                        : 0
        };
};


.........

enum {
        _classid = _hash_<"cMyClass">::value
};

---

It produces compile errors. I can imagine the reason, (I'm afraid this is fairly stupid idea :S) but I'd like to know if there's any way around.

Thanks in advance

Quote:

---

Originally Posted by muse1987

Hi

I'm gonna implement a dynamic type-cast mechanism. I need to give unique ID to all classes, and I think hash value calculated from the name of class would be appropriate.

---

You have typeid() to get you a compiler-defined name for your classes.

Regards,

Paul McKenzie

Why don't you make the struct _hash_ as a function that takes a const char*? And no, you cannot templatize on string literals.

Code:

---

template <char const* const psz>
struct _hash_
{
        enum {
                value = *psz
                        ? (_hash_<psz+1>::value << 2) | *psz
                        : 0
        };
};

---

Should be :

Code:

---

template <const char const*  psz>

---

I hope this help.