> Guido> Another argument for deriving bool from int: implementation > Guido> inheritance. A bool must behave just like an int, and this is > Guido> most easily accomplished this way: the bool type doesn't have > Guido> implementations for most operations: it inherits them from the > Guido> int type, which find a bool acceptable where an int is > Guido> required. [ARK] > Liskov substitutibility would seem to suggest deriving int from bool, > not the other way around. That is: If I have a program that uses bool > values, I can change it so that it uses int values without affecting > the behavior of the program. The reverse is not true. > > I wonder if this is the circle-ellipse problem over again? Probably. We're inheriting implemetation. --Guido van Rossum (home page: http://www.python.org/~guido/)
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