class interface REAL_REF feature(s) from HASHABLE hash_code: INTEGER -- The hash-code value of Current. ensure good_hash_value: Result >= 0 feature(s) from NUMERIC infix "+" (other: like Current): like Current -- Sum with 'other' (commutative). require other /= Void infix "-" (other: like Current): like Current -- Result of substracting other. require other /= Void infix "*" (other: like Current): like Current -- Product by other. require other /= Void infix "/" (other: like Current): like Current -- Division by other. require other /= Void; divisible(other) infix "^" (exp: INTEGER): DOUBLE_REF -- Current raised to exp-th power. require exp >= 0 prefix "+": like Current -- Unary plus of Current. prefix "-": like Current -- Unary minus of Current. divisible (other: like Current): BOOLEAN -- May Current be divided by other ? require other /= Void one: like Current -- Neutral element for "*" and "/". zero: like Current -- Neutral element for "+" and "-". sign: INTEGER -- Sign of Current (0 -1 or 1). ensure - 1 <= Result; Result <= 1 infix "<" (other: like Current): BOOLEAN -- Is Current strictly less than other? require other_exists: other /= Void ensure asymmetric: Result implies not (other < Current) infix ">" (other: like Current): BOOLEAN -- Is Current strictly greater than other? require other_exists: other /= Void ensure definition: Result = (other < Current) feature(s) from COMPARABLE infix "<=" (other: like Current): BOOLEAN -- Is Current less than or equal other? require other_exists: other /= Void ensure definition: Result = (Current < other or is_equal(other)) infix ">=" (other: like Current): BOOLEAN -- Is Current greater than or equal than other? require other_exists: other /= Void ensure definition: Result = (other <= Current) in_range (lower, upper: like Current): BOOLEAN -- Return true if Current is in range [lower..upper] ensure Result = (Current >= lower and Current <= upper) compare (other: like Current): INTEGER -- If current object equal to other, 0; -- if smaller, -1; if greater, 1. require other_exists: other /= Void ensure equal_zero: Result = 0 = is_equal(other); smaller_negative: Result = - 1 = Current < other; greater_positive: Result = 1 = Current > other three_way_comparison (other: like Current): INTEGER -- If current object equal to other, 0; -- if smaller, -1; if greater, 1. require other_exists: other /= Void ensure equal_zero: Result = 0 = is_equal(other); smaller_negative: Result = - 1 = Current < other; greater_positive: Result = 1 = Current > other min (other: like Current): like Current -- Minimum of Current and other. require other /= Void ensure Result <= Current and then Result <= other; compare(Result) = 0 or else other.compare(Result) = 0 max (other: like Current): like Current -- Maximum of Current and other. require other /= Void ensure Result >= Current and then Result >= other; compare(Result) = 0 or else other.compare(Result) = 0 feature(s) from REAL_REF item: REAL feature(s) from REAL_REF set_item (value: like item) out_in_tagged_out_memory -- Append terse printable represention of current object -- in tagged_out_memory. fill_tagged_out_memory -- Append terse printable represention of current object -- in tagged_out_memory. end of REAL_REF