Posting again because the answer i got was incorrect and not compiling for me:

PLEASE CODE IN C++:

As well I am supposed to create a nested iterator class that supports the supports the end sentinel concept, but i'm not sure how to implement it.

Using the Standard C++ Library vector as an underlying implementation, create a Set template class that accepts only one of each type of object that you put into it. Make a nested iterator class that supports the end sentinel concept in Unit 16. Write test code for your Set in main(), using both your Set template class and the Standard C++ Library set template to verify that the behaviour is correct.