File: rev_assoc.doc

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\DOC rev_assoc

\TYPE {rev_assoc : (* -> (** # *) list -> (** # *))}

\SYNOPSIS
Searches a list of pairs for a pair whose second component equals a specified
value.

\KEYWORDS
list.

\DESCRIBE
{rev_assoc y [(x1,y1);...;(xn,yn)]} returns the first {(xi,yi)} in the list
such that {yi} equals {y}.

\FAILURE
Fails if no matching pair is found. This will always be the case if the list
is empty.

\EXAMPLE
{
#rev_assoc 2 [(1,4);(3,2);(2,5);(2,6)];;
(3, 2) : (int # int)
}
\SEEALSO
assoc, find, mem, tryfind, exists, forall.

\ENDDOC