CS 211: Introduction to Computer Programming II

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CS 211Introduction to Computer Programming II

• Instructor Brian M. Dennis
• Teaching Assistants
• Tom Lechner, Bin Lin, Rachel Goldsborough
• http//www.cs.northwestern.edu/bmd/cs211/

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Todays Topics

• More operator overloading
• Developing a class

• Reading 8.8 8.13

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Operator Overloading

• Syntactic extension
• Class mechanism
• Let's us add new datatypes
• But dont look like builtins
• Method syntax isn't always natural

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Operator Overloading

• What can be overloaded
• Most operators
• Can't do
• . ., ?
• Can't add any new ones
• Can't change associativity
• Can't change precedence
• Can't change arity
• Nothing done automatically for you
• Issues
• arity binary vs unary
• operator side

• Use cautiously
• Obscures behavior
• Can actually implement opposite behavior for an
  operator

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Thats a Wrap