.\"partitions a set of objects according to the action of a separator function
.TH unique_array 3

.SH NAME
unique_array() - partitions an array of objects into groups

.SH SYNOPSIS
mixed unique_array(object *obarr, string separator);

.SH DESCRIPTION
Groups objects together for which the `separator' function returns the same 
value. `obarr' should be an array of objects, other types are ignored.
The `separator' function is called only once in each object in `obarr'. The
return value is an array of arrays of objects on the form:
.PP
.nf
     ({
         ({Same1:1, Same1:2, Same1:3, .... Same1:N }),
         ({Same2:1, Same2:2, Same2:3, .... Same2:N }),
         ({Same3:1, Same3:2, Same3:3, .... Same3:N }),
                       ....
                       ....
         ({SameM:1, SameM:2, SameM:3, .... SameM:N }),
     })