#include "ece250.h" #include "Single_node.h" #include "Exception.h" template Single_node::Single_node( Type const &e, Single_node *n ): element( e ), next_node( n ) { // empty constructor } template Type Single_node::retrieve() const { // enter your implementation here return Type(); } template Single_node *Single_node::next() const { // enter your implementation here return 0; } // Is an error showing up in ece250.h or elsewhere? // Did you forget a closing '}' ?