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\DOC mapf
\TYPE {mapf : ('a -> 'b) -> ('c, 'a) func -> ('c, 'b) func}
\SYNOPSIS
Maps a function over the range 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 function {mapf f p} applies the (ordinary OCaml) function {f} to all
the range elements of a finite partial function, so if it originally mapped
{xi} to {yi} for it now maps {xi} to {f(yi)}.
\FAILURE
Fails if the function fails on one of the {yi}.
\EXAMPLE
{
# let f = (1 |=> 2);;
val f : (int, int) func = <func>
# mapf string_of_int f;;
val it : (int, string) func = <func>
# apply it 1;;
}
\SEEALSO
|->, |=>, apply, applyd, choose, combine, defined, dom, foldl, foldr,
graph, is_undefined, ran, tryapplyd, undefine, undefined.
\ENDDOC
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