how to implement is_pointer?

Question

I want to implement is_pointer. I want something like this:

template 
bool is_pointer( T t )
{
   // implementation
} // return true or fa         


        

Answer 1

template 
bool is_pointer(T const &t) // edited: was "T t"; see the comments
{
   return false;
}

template 
bool is_pointer(T *t)
{
   return true;
}

You might not believe it, but it works. The reason is that the most specific template implementation will be chosen, which is the one which takes the pointer type.