18.4 (cont.) "The Big 3" (revisit)

The "Big 3":

1. Copy constructor
2. Assignment operator
3. Destructor

• All have default behavior, as does the default c'tor
• Behavior sometimes needs to be extended
• Reason to define one => reason to define all 3 (or all 4)
• Build all 3 on lower-level helper methods

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