note description: "Collection, where each element must be unique." library: "Free implementation of ELKS library" legal: "See notice at end of class." status: "See notice at end of class." names: set access: membership contents: generic date: "$Date: 2012-07-23 21:02:19 +0000 (Mon, 23 Jul 2012) $" revision: "$Revision: 91989 $" deferred class SET [G] inherit COLLECTION [G] redefine changeable_comparison_criterion end feature -- Measurement count: INTEGER_32 -- Number of items deferred end feature -- Element change extend (v: G) -- Ensure that set includes v. -- Was declared in SET as synonym of put. deferred ensure then in_set_already: old has (v) implies (count = old count) added_to_set: not old has (v) implies (count = old count + 1) end put (v: G) -- Ensure that set includes v. -- Was declared in SET as synonym of extend. deferred ensure then in_set_already: old has (v) implies (count = old count) added_to_set: not old has (v) implies (count = old count + 1) end feature -- Removal prune (v: G) -- Remove v if present. deferred ensure then removed_count_change: old has (v) implies (count = old count - 1) not_removed_no_count_change: not old has (v) implies (count = old count) item_deleted: not has (v) end changeable_comparison_criterion: BOOLEAN -- May object_comparison be changed? -- (Answer: only if set empty; otherwise insertions might -- introduce duplicates, destroying the set property.) do Result := is_empty ensure then only_on_empty: Result = is_empty end note copyright: "Copyright (c) 1984-2012, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 5949 Hollister Ave., Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Website http://www.eiffel.com Customer support http://support.eiffel.com ]" end -- class SET
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