Interface vs' Implementation

1
Interface vs. Implementation

• What is the difference?
• Private members?
• Constructors?
• Who needs to know the interface?
• Who needs to know the implementation?
• Is it harmful to expose the implementation?

2

• Remember to provide enough detail so that a user
  can actually use your library.
• Mixed content
• ltegt This is content. ltchildgtHellolt/childgt
  This is some more content. ltchildgtGoodbyelt/child
  gt Some content.lt/egt

3

• XML guarantees one root node.
• Should you have public member fields?

4

• You can think like a real developer.
• Should a functionality be included if it is
  useful?
• How should software be divided into modules? What
  is a good division? What is a bad division?

5

• Do callback example.