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\DOC undefined
\TYPE {undefined : ('a, 'b) func}
\SYNOPSIS
Completely undefined finite partial function.
\DESCRIBE
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
Not applicable.
\EXAMPLE
{
# (undefined:(string,term)func);;
val it : (string, term) func = <func>
# apply it "anything";;
Exception: Failure "apply".
}
\USES
Starting a function to be augmented pointwise.
\SEEALSO
|->, |=>, apply, applyd, choose, combine, defined, dom, foldl, foldr,
graph, is_undefined, mapf, ran, tryapplyd, undefine.
\ENDDOC
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