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\DOC is_undefined
\TYPE {is_undefined : ('a, 'b) func -> bool}
\SYNOPSIS
Tests if a finite partial function is defined nowhere.
\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 predicate {is_undefined} tests if the argument is the completely
undefined function.
\FAILURE
Never fails.
\EXAMPLE
{
# let x = undefined and y = (1 |=> 2);;
val x : ('a, 'b) func = <func>
val y : (int, int) func = <func>
# is_undefined x;;
val it : bool = true
# is_undefined y;;
val it : bool = false
}
\SEEALSO
|->, |=>, apply, applyd, choose, combine, defined, dom, foldl, foldr,
graph, mapf, ran, tryapplyd, undefine, undefined.
\ENDDOC
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