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indexing description: "References to objects containing a boolean value" status: "See notice at end of class" date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $" revision: "$Revision: 51435 $" class BOOLEAN_REF feature -- Access hash_code: INTEGER is -- Hash code value do Result := 1 ensure -- from HASHABLE good_hash_value: Result >= 0 end item: BOOLEAN -- Boolean value feature -- Status report is_hashable: BOOLEAN is -- May current object be hashed? -- (True if it is not its type's default.) do Result := item ensure -- from HASHABLE ok_if_not_default: Result implies (Current /= default) end feature -- Element change set_item (b: BOOLEAN) is -- Make b the item value. do item := b end feature -- Conversion to_integer: INTEGER is -- 1 if True -- 0 if False do if item then Result := 1 end ensure zero_or_one: Result = 0 or Result = 1 item_implies_one: item implies Result = 1 end feature -- Basic operations infix "and" (other: like Current): BOOLEAN is -- Boolean conjunction with other require other_exists: other /= void do Result := item and other.item ensure de_morgan: Result = not (not Current or not other) commutative: Result = (other and Current) consistent_with_semi_strict: Result implies (Current and then other) end infix "and then" (other: like Current): BOOLEAN is -- Boolean semi-strict conjunction with other require other_exists: other /= void do Result := item and then other.item ensure de_morgan: Result = not (not Current or else not other) end infix "implies" (other: like Current): BOOLEAN is -- Boolean implication of other -- (semi-strict) require other_exists: other /= void do Result := item implies other.item ensure definition: Result = (not Current or else other) end prefix "not": like Current is -- Negation do create Result Result.set_item (not item) end infix "or" (other: like Current): BOOLEAN is -- Boolean disjunction with other require other_exists: other /= void do Result := item or other.item ensure de_morgan: Result = not (not Current and not other) commutative: Result = (other or Current) consistent_with_semi_strict: Result implies (Current or else other) end infix "or else" (other: like Current): BOOLEAN is -- Boolean semi-strict disjunction with other require other_exists: other /= void do Result := item or else other.item ensure de_morgan: Result = not (not Current and then not other) end infix "xor" (other: like Current): BOOLEAN is -- Boolean exclusive or with other require other_exists: other /= void do Result := item xor other.item ensure definition: Result = ((Current or other) and not (Current and other)) end feature -- Output out: STRING is -- Printable representation of boolean do if item then Result := "True" else Result := "False" end end invariant involutive_negation: is_equal (not (not Current)) non_contradiction: not (Current and (not Current)) completeness: Current or else (not Current) -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) indexing library: "[ EiffelBase: Library of reusable components for Eiffel. ]" status: "[ Copyright 1986-2001 Interactive Software Engineering (ISE). For ISE customers the original versions are an ISE product covered by the ISE Eiffel license and support agreements. ]" license: "[ EiffelBase may now be used by anyone as FREE SOFTWARE to develop any product, public-domain or commercial, without payment to ISE, under the terms of the ISE Free Eiffel Library License (IFELL) at http://eiffel.com/products/base/license.html. ]" source: "[ Interactive Software Engineering Inc. ISE Building 360 Storke Road, Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Electronic mail <info@eiffel.com> Customer support http://support.eiffel.com ]" info: "[ For latest info see award-winning pages: http://eiffel.com ]" end -- class BOOLEAN_REF
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