note description: "Truth values, with the boolean operations." external_name: "System.Boolean" assembly: "mscorlib" library: "Free implementation of ELKS library" status: "See notice at end of class." legal: "See notice at end of class." date: "$Date: 2020-05-10 07:15:38 +0000 (Sun, 10 May 2020) $" revision: "$Revision: 104128 $" frozen expanded class interface BOOLEAN create default_create -- Process instances of classes with no creation clause. -- (Default: do nothing.) -- (from ANY) make_from_reference (v: BOOLEAN_REF) -- Initialize Current with v.item. -- (from BOOLEAN_REF) require -- from BOOLEAN_REF v_not_void: v /= Void ensure -- from BOOLEAN_REF item_set: item = v.item convert make_from_reference ({BOOLEAN_REF}) feature -- Access generating_type: TYPE [detachable BOOLEAN] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty hash_code: INTEGER_32 -- Hash code value. -- (from BOOLEAN_REF) ensure -- from HASHABLE good_hash_value: Result >= 0 item: BOOLEAN -- Boolean value. -- (from BOOLEAN_REF) feature -- Comparison frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void -- or attached to isomorphic object structures? -- (from ANY) ensure -- from ANY instance_free: class shallow_implies_deep: standard_equal (a, b) implies Result both_or_none_void: (a = Void) implies (Result = (b = Void)) same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b)) symmetric: Result implies deep_equal (b, a) frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached -- to objects considered equal? -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal alias "≡≡≡" (other: BOOLEAN): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY shallow_implies_deep: standard_is_equal (other) implies Result same_type: Result implies same_type (other) symmetric: Result implies other.is_deep_equal (Current) is_equal (other: BOOLEAN): BOOLEAN -- Is other attached to an object considered -- equal to current object? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached to -- field-by-field identical objects of the same type? -- Always uses default object comparison criterion. -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal alias "≜" (other: BOOLEAN): BOOLEAN -- Is other attached to an object of the same type -- as current object, and field-by-field identical to it? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) feature -- Status report conforms_to (other: ANY): BOOLEAN -- Does type of current object conform to type -- of other (as per Eiffel: The Language, chapter 13)? -- (from ANY) require -- from ANY other_not_void: other /= Void is_hashable: BOOLEAN -- May current object be hashed? -- (True by default.) -- (from HASHABLE) same_type (other: ANY): BOOLEAN -- Is type of current object identical to type of other? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) feature -- Element change set_item (b: BOOLEAN) -- Make b the item value. -- (from BOOLEAN_REF) feature -- Conversion to_integer: INTEGER_32 -- 1 if True. -- 0 if False. -- (from BOOLEAN_REF) ensure -- from BOOLEAN_REF not_item_implies_zero: not item implies Result = 0 item_implies_one: item implies Result = 1 to_reference: BOOLEAN_REF -- Associated reference of Current. -- (from BOOLEAN_REF) ensure -- from BOOLEAN_REF to_reference_not_void: Result /= Void same_item: Result.item = item feature -- Duplication copy (other: BOOLEAN) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: BOOLEAN) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: BOOLEAN -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: BOOLEAN) -- Copy every field of other onto corresponding field -- of current object. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: BOOLEAN -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: BOOLEAN -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations conjuncted alias "and" alias "∧" (other: BOOLEAN): BOOLEAN -- Boolean conjunction with other. require -- from BOOLEAN_REF other_exists: other /= Void ensure -- from BOOLEAN_REF de_morgan: Result = not (not Current or not other) commutative: Result = (other and Current) consistent_with_semi_strict: Result implies (Current and then other) conjuncted_semistrict alias "and then" alias "∧…" (other: BOOLEAN): BOOLEAN -- Boolean semi-strict conjunction with other. require -- from BOOLEAN_REF other_exists: other /= Void ensure -- from BOOLEAN_REF de_morgan: Result = not (not Current or else not other) frozen default: detachable BOOLEAN -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) disjuncted alias "or" alias "∨" (other: BOOLEAN): BOOLEAN -- Boolean disjunction with other. require -- from BOOLEAN_REF other_exists: other /= Void ensure -- from BOOLEAN_REF de_morgan: Result = not (not Current and not other) commutative: Result = (other or Current) consistent_with_semi_strict: Result implies (Current or else other) disjuncted_exclusive alias "xor" alias "⊻" (other: BOOLEAN): BOOLEAN -- Boolean exclusive or with other. require -- from BOOLEAN_REF other_exists: other /= Void ensure -- from BOOLEAN_REF definition: Result = ((Current or other) and not (Current and other)) disjuncted_semistrict alias "or else" alias "∨…" (other: BOOLEAN): BOOLEAN -- Boolean semi-strict disjunction with other. require -- from BOOLEAN_REF other_exists: other /= Void ensure -- from BOOLEAN_REF de_morgan: Result = not (not Current and then not other) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class implication alias "implies" alias "⇒" (other: BOOLEAN): BOOLEAN -- Boolean implication of other. -- (semi-strict) require -- from BOOLEAN_REF other_exists: other /= Void ensure -- from BOOLEAN_REF definition: Result = (not Current or else create {BOOLEAN}.make_from_reference (other)) negated alias "not" alias "¬": BOOLEAN -- Negation. feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- Printable representation of boolean. -- (from BOOLEAN_REF) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void invariant -- from BOOLEAN_REF involutive_negation: (not (not Current)).item = item non_contradiction: not ((not Current) and create {BOOLEAN}.make_from_reference (Current)) completeness: (not Current) or create {BOOLEAN}.make_from_reference (Current) -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) note copyright: "Copyright (c) 1984-2020, 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 BOOLEAN
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