is?

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is?

$\begin{usage} is?(t, op) \end{usage}$

Signature

is?: (%, ExpressionTreeOperator) $\to$ Boolean

$\begin{params} {\em t} & \% & An expression tree\\ {\em op} & \htmlref{\texttt{ExpressionTreeOperator}}{ExpressionTreeOperator} & An operator\\\end{params}$

$\begin{retval} is?(t, op) returns {\it true}\xspace ~if t is of the form op(args), {\it false}\xspace ~otherwise. \end{retval}$

Manuel Bronstein 2000-12-13