C++ compile time function execution

Question

I have string tags in my code that are converted to numbers and used to search values in a tag-value structure.

I have something like this:

void foo(         


        

Answer 1

Not sure that you can. Is the list of possible tags small? Even if not, is it small most of the time. If so, you can use template specialization on a subset of the tags

template 
int toNumber() {
    return toNumber(tag);
}

template<>
int toNumber<"0">() {
     return 0;
}

template<>
int toNumber<"1">() {
     return 1;
}

(caveats: my specialization syntax might be wrong, and I have no idea if this works for char*)