CS 112 Lab 10: AccountManager::changeUserName() Hint

The stub of AccountManager::changeUserName() should look like this:

   void AccountManager::changeUserName(const string& oldName, const string& newName) {
   }

This method should behave as follows:

Use myAccounts.find() to get an iterator it pointing to the pair containing userName and its password.
If it is different from myAccounts.end():
- Use it->second to retrieve the password, and save it in password.
- Try
  1. Use erase(it) to remove the (oldUserName, password) pair from myAccounts.
  2. Use createNewAccount(newName, password) to replace it.
  If either throws an exception, throw it on to the sender of this message.
Otherwise:

Throw an exception.

To declare the iterator it, review how we declared an iterator in Part I of today's exercise. You will need to do something similar, but since myAccounts is a map, you will need to declare this iterator using a map instead of a set.