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\DOC dom
\TYPE {dom : ('a, 'b) func -> 'a list}
\SYNOPSIS
Returns domain of a 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 {dom} operation returns the domain of such a function, i.e. the set of
points on which it is defined.
\FAILURE
Attempts to sort the resulting list, so may fail if the domain type does
not admit comparisons.
\EXAMPLE
{
# dom (1 |=> "1");;
val it : int list = [1]
# dom(itlist I [2|->4; 3|->6] undefined);;
val it : int list = [2; 3]
}
\SEEALSO
|->, |=>, apply, applyd, choose, combine, defined, foldl, foldr,
graph, is_undefined, mapf, ran, tryapplyd, undefine, undefined.
\ENDDOC
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