On Aug 30, 2010, at 3:45 PM, Paul C. Anagnostopoulos wrote:
As an example of a PMC that inherits from Integer and might rely on
the current behavior, I give you Boolean. It inherits 'neg' and
relies on the fact that it does not promote to implement the
following bizarre behavior:
-(Boolean true) => true
-(Boolean false) => false
I will simply implement 'neg' in Boolean to preserve this whackiness.
What's so odd about that? If you think of 'false' as zero, then the
inverse of zero equals zero (false) and the inverse of any non-zero
integer is non-zero (true, e.g. 1 -> -1). Though if Boolean is a one-
bit integer, it must be an unsigned type, and -true will wrap around
to true anyway.
Josh
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