Inherited: what changed

Revision 2 to 3. Removed lines have a minus sign; added lines have a plus sign.

Title: ~~inherited~~ Inherited

Old	New		Line
1		-	~~#REDIRECT [[Inherited]]~~
	1	+	Back to [[Reserved words]].
	2	+
	3	+	In an overridden virtual [[Method\|method]], it is often necessary to call the parent [[Class\|class]]’ implementation of the virtual method. This can be done with the `inherited` [[Reserved word\|reserved word]]. Likewise, the `inherited` [[Keyword\|keyword]] can be used to call any method of the parent `class`.
	4	+
	5	+	This case is the simplest:
	6	+
	7	+	``` pascal
	8	+	Type
	9	+	TMyClass = Class(TComponent)
	10	+	Constructor Create(AOwner : TComponent); override;
	11	+	end;
	12	+
	13	+	Constructor TMyClass.Create(AOwner : TComponent);
	14	+	begin
	15	+	Inherited;
	16	+	// Do more things
	17	+	end;
	18	+	```
	19	+
	20	+	## Constructors and destructors case
	21	+
	22	+	[[Constructor]], example 1 :
	23	+
	24	+	``` pascal
	25	+	...
	26	+	TTest.Create;
	27	+	begin
	28	+	Inherited; // Always at the beginning of the constructors and start the constructor (code only) of the parent class
	29	+	...
	30	+	end;
	31	+	```
	32	+
	33	+	`Constructor`, example 2 :
	34	+
	35	+	``` pascal
	36	+	...
	37	+	TTest.Create(...);
	38	+	begin
	39	+	Inherited Create(...); // Always at the beginning of the constructors and start the constructor (code only) of the parent class
	40	+	...
	41	+	end;
	42	+	...
	43	+	```
	44	+
	45	+	[[Destructor]], example 3 :
	46	+
	47	+	``` pascal
	48	+	TTest.Destroy;
	49	+	begin
	50	+	...
	51	+	Inherited; // Always at the end of the destructors and start the destructor (code only) of the parent class
	52	+	end;
	53	+	...
	54	+	```
	55	+
	56	+	## Virtual methods override
	57	+
	58	+	``` pascal
	59	+	type
	60	+	TMyClass = class(TStrings)
	61	+	function GetObject(Index: Integer): TObject; override;
	62	+	end;
	63	+
	64	+	function TMyClass.GetObject(Index: Integer): TObject;
	65	+	begin
	66	+	// Get result from parent class method
	67	+	Result := inherited GetObject(Index);
	68	+	// Do something
	69	+	end;
	70	+	```
	71	+
	72	+	---
	73	+	From the Free Pascal wiki, page "Inherited", as it stood on 2022-08-06 after a change by Kai Burghardt, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).

Back to history