# Section 8.12.1.7:
$SIGNED

negate : NTP ; -- This routine returns the negation of self provided that this is -- representable in the value domain. Note that this is an implementation -- issue dependent upon the numeric model designed into the CPU -- eg if -- it is twos-complement then it is not possible to negate the minimum -- value. negatable : BOOL ; -- This routine returns true if and only if the negated value of -- self is within the value domain of the class NTP. is_neg : BOOL ; -- This feature returns true if and only if the number is negative.

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