SYNOPSIS
        object present(mixed str)
        object present(mixed str, object ob)

DESCRIPTION
        If an object that identifies (*) to the name ``str'' is present
        in the inventory or environment of this_object(), then return
        it. If "str" has the form "<id> <n>" the <n>-th object matching
        <id> will be returned.

        "str" can also be an object, in which case the test is much faster
        and easier.

        A second optional argument ob is the enviroment where the search
        for str takes place. Normally this_player() is a good choice.
        Only the inventory of ob is searched, not its environment.

        (*) id (str) { return str == <name>; }
        i.e. the parser applies id(str) to all objects in the vicinity
        until the matching one (if any) is found.

        If you want an object to support the "<id> <n>" syntax in
        conjunction with self-defined verbs (like "open chest 3") you
        can do it like that:

        init () { add_action ("open_chest", "open"); }

        open_chest (str) {
          if (present (str) != this_object ())
              return 0; /* Not this chest */
          ...
        }

        Btw: if the n-th object matching "str" is searched in this_object()
        and it's environment and the object is found in the environment
        then it will be the n-th occurence of ``str'' in the environment
        and not in both objects.

SEE ALSO
        move_object(E), environment(E), this_object(E), present_clone(E)
        id(A), init(A)