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Datatypes R2 Issue 65

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Data Types Issue 65: IVL low/high and center/width issue

Introduction

[from Charlie]

There is an error in the abstract datatypes that is not helping us > here invariant(IVL<T> x) > where x.low.isNull.or(x.high.isNull) { > x.center.notApplicable; > }; > This cannot be true -- since center is used exactly when high and low > are unknown (ie null). I think that this should be invariant(IVL<T> > x) > where x.low.isNull.xor(x.high.isNull) { > x.center.notApplicable; > };

Discussion

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