note description: "[ Active data structures, which at every stage have a possibly undefined current item. Basic access and modification operations apply to the current item. ]" library: "Free implementation of ELKS library" legal: "See notice at end of class." status: "See notice at end of class." names: active, access access: membership contents: generic date: "$Date: 2017-04-10 07:37:21 +0000 (Mon, 10 Apr 2017) $" revision: "$Revision: 100119 $" deferred class ACTIVE [G] inherit BAG [G] feature -- Access item: G -- Current item require readable: readable deferred end feature -- Status report readable: BOOLEAN -- Is there a current item that may be read? deferred end writable: BOOLEAN -- Is there a current item that may be modified? deferred end replaceable: BOOLEAN -- Can current item be replaced? do Result := True end feature -- Element change replace (v: G) -- Replace current item by v. require writable: writable replaceable: replaceable deferred ensure item_replaced: item = v end feature -- Removal remove -- Remove current item. require prunable: prunable writable: writable deferred end invariant writable_constraint: writable implies readable empty_constraint: is_empty implies (not readable) and (not writable) note copyright: "Copyright (c) 1984-2017, 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 ACTIVE
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