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5.4 Rows operators ¶

The following operators work on any row mode, denoted below using the pseudo-mode rows.

Operator: lwb = (rows a) int ¶

Monadic operator that yields the lower bound of the first bound pair of the descriptor of the value of a.

Operator: upb = (rows a) int ¶

Monadic operator that yields the upper bound of the first bound pair of the descriptor of the value of a.

Operator: lwb = (int n, rows a) int ¶

Dyadic operator that yields the lower bound in the n-th bound pair of the descriptor of the value of a, if that bound pair exists. Attempting to access a non-existing bound pair results in a run-time error.

Operator: upb = (int n, rows a) int ¶

Dyadic operator that yields the upper bound in the n-th bound pair of the descriptor of the value of a, if that bound pair exists. Attempting to access a non-existing bound pair results in a run-time error.