🚀 go-pugleaf

In article <4khepk$8k1@decaxp.HARVARD.EDU> ccshan@scws44.harvard.edu
(Chung-chieh Shan) writes:
>According to the proposed standard, true is implicitly casted from
>bool to the integer 1.  Nonzero integers are implicitly casted from
>int to the bool true.
>
>Funny nobody has written an implementation of bool. (AFAIK)

That may be because you can't write a class that behaves like the
draft standard bool type.  In the draft standard, all the standard
boolean operators actually return a bool type, and there's no way to
produce that effect with a user-defined type.  E.g.,

   int f(int) { return 1; }
   int f(bool) { return 0; }
   int distinguish() { return f( 0 == 1 ); }

No user-level definition of bool will make distinguish() return 0, as
it must in the draft standard.

-David
-- 
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David Wald      http://theory.lcs.mit.edu/~wald/     wald@theory.lcs.mit.edu
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