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note description: "Intervals between absolute values" legal: "See notice at end of class." status: "See notice at end of class." date: "$Date: 2020-04-15 10:06:04 -0800 (Wed, 15 Apr 2020) $" revision: "$Revision: 104046 $" class interface INTERVAL [G -> ABSOLUTE] create make (s, e: G) -- Sets start_bound and end_bound to s and e respectively. require start_exists: s /= Void end_exists: e /= Void start_before_end: s <= e ensure start_bound_set: start_bound /= Void and then deep_equal (start_bound, s) end_bound_set: end_bound /= Void and then deep_equal (end_bound, e) feature -- Initialization make (s, e: G) -- Sets start_bound and end_bound to s and e respectively. require start_exists: s /= Void end_exists: e /= Void start_before_end: s <= e ensure start_bound_set: start_bound /= Void and then deep_equal (start_bound, s) end_bound_set: end_bound /= Void and then deep_equal (end_bound, e) feature -- Access end_bound: G -- End bound of the current interval. generating_type: TYPE [detachable INTERVAL [G]] -- 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 start_bound: G -- Start bound of the current interval. feature -- Measurement duration: DURATION -- Length of the interval. 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)) includes (other: like Current): BOOLEAN -- Does current interval include other? intersects (other: like Current): BOOLEAN -- Does current interval intersect other? require other_exists: other /= Void frozen is_deep_equal alias "≡≡≡" (other: INTERVAL [G]): 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: like Current): BOOLEAN -- Is current interval equal to other? require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result is_greater alias ">" (other: like Current): BOOLEAN -- Is current interval after other? is_greater_equal alias ">=" alias "" (other: like Current): BOOLEAN -- Is current interval after other? is_included_by (other: like Current): BOOLEAN -- Is current interval included by other? is_less alias "<" (other: like Current): BOOLEAN -- Is current interval strictly before other? is_less_equal alias "<=" alias "" (other: like Current): BOOLEAN -- Is current interval before other? is_met_by (other: like Current): BOOLEAN -- Is current interval met by other? require other_exists: other /= Void ensure symmetry: Result = other.meets (Current) is_overlapped_by (other: like Current): BOOLEAN -- Is current interval overlapped by other? require other_exists: other /= Void ensure symmetry: Result = other.overlaps (Current) is_strict_included_by (other: like Current): BOOLEAN -- Is current interval strictly included by other? meets (other: like Current): BOOLEAN -- Does current interval meet other? require other_exists: other /= Void ensure symmetry: Result = other.is_met_by (Current) result_definition: Result = (Current <= other and intersects (other)) overlaps (other: like Current): BOOLEAN -- Does current interval overlap other? require other_exists: other /= Void ensure result_defition: Result = (strict_before (other.end_bound) and has (other.start_bound)) symmetry: Result = other.is_overlapped_by (Current) 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: INTERVAL [G]): 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) strict_includes (other: like Current): BOOLEAN -- Does current interval strictly include other? feature -- Status report after (v: G): BOOLEAN -- Is the current interval after v? require exists: v /= Void ensure result_definition: Result = (start_bound >= v) before (v: G): BOOLEAN -- Is the current interval before v? require exists: v /= Void ensure result_definition: Result = (end_bound <= v) 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 empty: BOOLEAN -- Is current interval empty? ensure result_definition: Result = duration.is_equal (duration.zero) has (v: G): BOOLEAN -- Does current interval have v between its bounds? require exists: v /= Void ensure result_definition: Result xor not (start_bound <= v and then end_bound >= v) 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)) strict_after (v: G): BOOLEAN -- Is the current interval strictly after v? require exists: v /= Void ensure result_definition: Result = (start_bound > v) strict_before (v: G): BOOLEAN -- Is the current interval strictly before v? require exists: v /= Void ensure result_definition: Result = (end_bound < v) feature -- Element change set_end_bound (e: G) -- Set end_bound to e. require end_bound_exists: e /= Void end_after_start_bound: e >= start_bound ensure end_bound_set: equal (end_bound, e) set_start_bound (s: G) -- Set start_bound to s. require start_bound_exists: s /= Void start_before_end_bound: s <= end_bound ensure start_bound_set: equal (start_bound, s) feature -- Duplication copy (other: INTERVAL [G]) -- 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: INTERVAL [G]) -- 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: INTERVAL [G] -- 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: INTERVAL [G]) -- 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: INTERVAL [G] -- 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: INTERVAL [G] -- 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 INTERVAL [G] -- 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 gather (other: like Current): like Current -- Union of other and current interval if other meets -- current interval. require other_exist: other /= Void meeting_interval: meets (other) ensure result_exist: Result /= Void result_same_as_union: Result.is_equal (union (other)) intersection (other: like Current): detachable like Current -- Intersection with other. require other_exists: other /= Void ensure intersects_validity: intersects (other) = attached Result result_is_included_by_current: attached Result implies includes (Result) result_is_included_by_other: attached Result implies other.includes (Result) union (other: like Current): like Current -- Union with other. require other_exists: other /= Void intersects: intersects (other) ensure result_exists: Result /= Void result_includes_current: Result.includes (Current) result_includes_other: Result.includes (other) 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 the current interval. 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 start_bound_exists: start_bound /= Void end_bound_exists: end_bound /= Void start_bound_before_end_bound: start_bound <= end_bound current_intersection: intersection (Current) ~ Current current_union: union (Current).is_equal (Current) has_bounds: has (start_bound) and has (end_bound) between_bound: after (start_bound) and before (end_bound) -- 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 INTERVAL
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