Comparison operators

Stable Numerics Subroutine Library
Programming Reference Manual
Version 1.0 DD-00006-010

5.2.5 Comparison operators

bool operator==(const interval<T>& o) const;
bool operator!=(const interval<T>& o) const;
bool operator==(const std::pair<T,T>& o) const;
bool operator!=(const std::pair<T,T>& o) const;

These two operators check the equality or inequality of the infinimum and supremum element-wise. Let $T,O ∈IR$ with $T$ being the current instance, this and $O$ being the given other interval to compare to, that is o:

operator==(const interval<T>&) and operator==(const std::pair<T,T>&): Set equality operation, as defined as $- (t= o)∧ (t= o)$ . With either an other interval or a std::pair whose first element is interpreted as $o$ and second element $o$ .
operator!=(const interval<T>&) and operator!=(const std::pair<T,T>&): Set inequality operation, as defined as $- (t̸= o)∨ (t̸= o)$ . With either an other interval or a std::pair whose first element is interpreted as $o$ and second element $o$ .

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