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note description: "String - Integer/Natural conversion overflow checker" library: "Free implementation of ELKS library" status: "See notice at end of class." legal: "See notice at end of class." date: "$Date: 2017-03-23 12:42:57 -0800 (Thu, 23 Mar 2017) $" revision: "$Revision: 100036 $" class interface INTEGER_OVERFLOW_CHECKER create make -- Initialize. feature -- Access generating_type: TYPE [detachable INTEGER_OVERFLOW_CHECKER] -- 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 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: INTEGER_OVERFLOW_CHECKER): 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: INTEGER_OVERFLOW_CHECKER): 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: INTEGER_OVERFLOW_CHECKER): 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 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 -- Duplication copy (other: INTEGER_OVERFLOW_CHECKER) -- 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: INTEGER_OVERFLOW_CHECKER) -- 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: INTEGER_OVERFLOW_CHECKER -- 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: INTEGER_OVERFLOW_CHECKER) -- 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: INTEGER_OVERFLOW_CHECKER -- 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: INTEGER_OVERFLOW_CHECKER -- 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 frozen default: detachable INTEGER_OVERFLOW_CHECKER -- 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) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class 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 -- New string containing terse printable representation -- of current object -- (from ANY) 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 -- Overflow checking will_overflow (part1: like max_natural_type; part2: like max_natural_type; type: INTEGER_32; sign: INTEGER_32): BOOLEAN -- Will part1 * 10 + part2 with sign overflow -- if we convert it to an number of type? require type_valid: integer_natural_type_valid (type) 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 feature -- Type checking double_type_valid (type: INTEGER_32): BOOLEAN -- Is type a valid double type? -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class integer_natural_type_valid (type: INTEGER_32): BOOLEAN -- Is type a valid integer/natural type? -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class integer_type_valid (type: INTEGER_32): BOOLEAN -- Is type a valid integer type? -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class natural_type_valid (type: INTEGER_32): BOOLEAN -- Is type a valid natural type? -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class real_double_type_valid (type: INTEGER_32): BOOLEAN -- Is type a valid real/double type? -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class real_type_valid (type: INTEGER_32): BOOLEAN -- Is type a valid real type? -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class feature -- Types max_integer_type: INTEGER_64 -- INTEGER type of max word length -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class max_natural_type: NATURAL_64 -- NATURAL type of max word length -- (from NUMERIC_INFORMATION) ensure -- from NUMERIC_INFORMATION instance_free: class Type_count: INTEGER_32 = 4 -- Number of types of integer/natural in Eiffel -- (from NUMERIC_INFORMATION) Type_double: INTEGER_32 = 101 -- Real/Double type indicators -- (from NUMERIC_INFORMATION) Type_integer: INTEGER_32 = 3 -- Was declared in NUMERIC_INFORMATION as synonym of Type_integer_32. -- (from NUMERIC_INFORMATION) Type_integer_16: INTEGER_32 = 2 -- (from NUMERIC_INFORMATION) Type_integer_32: INTEGER_32 = 3 -- Was declared in NUMERIC_INFORMATION as synonym of Type_integer. -- (from NUMERIC_INFORMATION) Type_integer_64: INTEGER_32 = 4 -- (from NUMERIC_INFORMATION) Type_integer_8: INTEGER_32 = 1 -- (from NUMERIC_INFORMATION) Type_integer_natural_separator: INTEGER_32 = 10 -- (from NUMERIC_INFORMATION) Type_natural: INTEGER_32 = 13 -- Was declared in NUMERIC_INFORMATION as synonym of Type_natural_32. -- (from NUMERIC_INFORMATION) Type_natural_16: INTEGER_32 = 12 -- (from NUMERIC_INFORMATION) Type_natural_32: INTEGER_32 = 13 -- Was declared in NUMERIC_INFORMATION as synonym of Type_natural. -- (from NUMERIC_INFORMATION) Type_natural_64: INTEGER_32 = 14 -- Integer/natural type indicators -- (from NUMERIC_INFORMATION) Type_natural_8: INTEGER_32 = 11 -- (from NUMERIC_INFORMATION) Type_no_limitation: INTEGER_32 = 0 -- Type representing a number sequence (no length limitation) -- (from NUMERIC_INFORMATION) Type_real: INTEGER_32 = 100 -- (from NUMERIC_INFORMATION) invariant -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) 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 INTEGER_OVERFLOW_CHECKER
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