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Quote: a type field leads to two kinds of errors in large programs: failure to test the type field and missed cases in a switch
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Group:
type checking
Topic:
dynamic vs. static data type
Topic:
union data type
Topic:
generic operations and polymorphism
Topic:
abstract functions
Quotation Skeleton
[Using a type field] typically leads to two kinds of errors … to place all possible cases in a switch … Both failures … are very hard to avoid when modifying a … [p. 189] Virtual functions overcome the problems with the … redefined in each derived class. … [p. 191] In a typical implementation [of virtual functions], the space … had you chosen to use the … type field solution a comparable amount of space … Google-1 Google-2
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Additional Titles
Quote: virtual functions avoid the need for type tests and case switches. They take nearly the same space as a type field
Group: type checking (12 topics, 385 quotes)
Topic: dynamic vs. static data type (19 items)
Topic: union data type (12 items)
Topic: generic operations and polymorphism (65 items)
Topic: abstract functions (11 items)