undefined : ('a, 'b) func

SYNOPSIS

Completely undefined finite partial function.

DESCRIPTION

This is one of a suite of operations on finite partial functions, type ('a,'b)func. These may sometimes be preferable to ordinary functions since they permit more operations such as equality comparison, extraction of domain etc. The value undefined is the `empty' finite partial function that is nowhere defined.

FAILURE CONDITIONS

Not applicable.

EXAMPLE

  # (undefined:(string,term)func);;
  val it : (string, term) func = 
  # apply it "anything";;
  Exception: Failure "apply".

USES

Starting a function to be augmented pointwise.