20.6 Private Inheritance - example
(cont.)
- Set method may call push_back
- push_back is not part of Set's interface:
Set a_set;
a_set.add("Sally"); // legal
a_set.push_back("Fred");
// Error--push_back not part of interface for Set
- Private inheritance is rarely used
- Set could've instead had a private List
attribute (aggregation)
- Similarly, protected inheritance exists, but is used even
less often
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