chickadee » srfi-217 » iset-delete-max!

Returns two values: the smallest/largest integer n in iset and a newly-allocated iset that contains all elements of iset except for n. It is an error if iset is empty.

The iset-delete-min! and iset-delete-max! procedures are the same as iset-delete-min and iset-delete-max, respectively, except that they are permitted to mutate and return the iset argument instead of allocating a new iset.

Examples:

   (let-values (((n set) (iset-delete-min (iset 2 3 5 7 11))))
     (list n (iset->list set)))
     ⇒ (2 (3 5 7 11))

   (let-values (((n set) (iset-delete-max (iset 2 3 5 7 11))))
     (list n (iset->list set)))
     ⇒ (11 (2 3 5 7))