Nested functions are not allowed but why nested function prototypes are allowed? [C++]

Question

I was reading the linked question which leads me to ask this question.

Consider the following code

int main()
{
    string SomeString();
}
         


        

Answer 1

Just as a side note, C++03 does have a roundabout way of defining local functions. It requires abusing the local-class feature:

int main()
{
    struct Local
    {
        static string Some()
        {
            return "";
        }
    };
    std::cout << Local::Some() << std::endl;
}