/// This function shows how methods are typically defined and then added
/// to an entity
void add_default_print_name(entity & e)
{
/// the definition must have the exact ACTUAL SIGNATURE.
auto print_name_def =
[](entity const & self)
{
std::cout << "My name is " << to_string(self.id()) << std::endl;
};
/// Set the print_name_ method to use print_name_def when called
e.set(print_name_, print_name_def);
};
