Delphi language features missing from the Free Pascal Compiler: what changed

Revision 1 to 2. Removed lines have a minus sign; added lines have a plus sign.

Old	New		Line
1	1		Note: some new Delphi features are already implemented in [[FPC New Features Trunk\|FPC trunk]].
2	2
3	3		## Contents
4	4
5	5		* 1 New since D4
6	6		* 1.1 Exporting of overloaded functions
7	7		* 1.2 implements delegation of interfaces
8	8		* 2 New since Delphi 2007
9	9		* 3 New since Delphi 2009
10	10		* 3.1 Anonymous Methods
11	11		* 4 New since Delphi 2010
12	12		* 4.1 Custom Attributes
13	13		* 4.2 Enhanced RTTI
14	14		* 4.3 Delayed directive
15	15		* 5 Misc
16	16		* 6 Already implemented
17	17		* 6.1 FPC 3.0.4/trunk
18	18		* 6.1.1 Advanced records
19	19		* 6.2 FPC 2.6.0
20	20		* 6.2.1 AS and IS extended for interfaces
21	21		* 7 Reference
22	22
23	23		## New since D4
24	24
25	25		### Exporting of overloaded functions
26	26
27	27		(version not entirely sure, but came in with overloading, so definitely pre-D6)
28	28
29	29		In library packages select an overloaded variant to export. Assume we have some overloaded methods:
30	30
31	31		function doSomeThing(a:type1):type2;stdcall; function doSomeThing(a:type3):type4;stdcall;
32	32
33	33		and in the library (for building the dll using the unit above) we want to export them:
34	34
35	35		exports
36	36		```
37	37		doSomeThing(a:type1) name 'doSomeThingTYPE1',
38	38		doSomeThing(a:type3) name 'doSomeThingTYPE3';
39	39		```
40	40
41	41		### implements delegation of interfaces
42	42
43	43		Delegating interfaces to classes is not always supported,
44	44
45	45		* [Mantis 16531](<http://bugs.freepascal.org/view.php?id=16531>)
46	46		* [Mantis 8591](<http://bugs.freepascal.org/view.php?id=8951>)
47	47		* [Mantis 23403](<http://bugs.freepascal.org/view.php?id=23403>)
48	48
49	49		## New since Delphi 2007
50	50
51	51		## New since Delphi 2009
52	52
53	53		#### Anonymous Methods
54	54
55	55		1. <http://docs.embarcadero.com/products/rad_studio/delphiAndcpp2009/HelpUpdate2/EN/html/devcommon/anonymousmethods_xml.html>
56	56		2. <http://delphi.about.com/od/objectpascalide/a/understanding-anonymous-methods-in-delphi.htm>
57	57
58	58		## New since Delphi 2010
59	59
60	60		#### Custom Attributes
61	61
62	62		Custom Attributes are a language feature in Delphi that allow annotating types and type members with special objects that carry additional information. Attributes extend the object-oriented model with aspect-oriented elements.
63	63
64	64		<http://delphi.about.com/od/oopindelphi/a/delphi-attributes-understanding-using-attributes-in-delphi.htm>
65	65
66	66		#### Enhanced RTTI
67	67
68	68		<http://docwiki.embarcadero.com/RADStudio/en/RTTI_directive_(Delphi)>
69	69
70	70		#### Delayed directive
71	71
72	72		Info is here: <http://docwiki.embarcadero.com/RADStudio/en/Libraries_and_Packages#Delayed_Loading> Some info about internals:
73	73
74	74		1. <http://blogs.embarcadero.com/abauer/2009/08/25/38894>
75	75		2. <http://blogs.embarcadero.com/abauer/2009/08/29/38896>
76	76		3. <http://blogs.embarcadero.com/chrishesik/2009/11/02/35056>
77	77
78	78		fpc wiki about that topic: <http://wiki.freepascal.org/Dynamically_loading_headers>
79	79
80	80		Originally I thought that delayed is similar to weakexternal which FPC has for some platforms but after reading this: <http://docwiki.embarcadero.com/CodeExamples/XE3/en/DelayedLoading_(Delphi)> I understand that this is simply a wrapper around LoadLibrary and GetProcessAdress with automatic loading and unloading.--[Paul Ishenin](</User:Paul_Ishenin> "User:Paul Ishenin") 13:45, 18 January 2013 (UTC)
81	81
82	82		## Misc
83	83
84	84		1. [[packages\|(Library) packages]]
85	85		2. "automated" keyword, which is like "public", but generates COM specific RTTI. Afaik this kind of COM usage is deprecated though.
86	86
87	87		## Already implemented
88	88
89	89		### FPC 3.0.4/trunk
90	90
91	91		#### Advanced records
92	92
93	93		<http://docwiki.embarcadero.com/RADStudio/en/Structured_Types#Records_.28advanced.29>
94	94
95	95		### FPC 2.6.0
96	96
97	97		#### AS and IS extended for interfaces
98	98
99	99		New since Delphi 2010. Info is here:
100	100
101	101		1. <http://docwiki.embarcadero.com/RADStudio/en/Interface_References#Casting_Interface_References_to_Objects>
102	102		2. <http://blogs.embarcadero.com/abauer/2009/08/21/38893>
103	103
104	104		Implemented in FPC 2.6.0.
105	105
106	106		## Reference
107	107
108	108		1. <http://edn.embarcadero.com/article/34324>
109	109		2. <http://edn.embarcadero.com/article/images/39076/New_Delphi_Coding_Styles_and_Architectures.pdf>
110	110		3. <http://docwiki.embarcadero.com/RADStudio/en/What's_New_in_Delphi_and_C%2B%2BBuilder_2010>
111	111
112	112		---
113		-	From the Free Pascal wiki, page "delphi language features which fpc does not have", as the Internet Archive kept it on 2022-10-01. 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).
	113	+	From the Free Pascal wiki, page "delphi language features which fpc does not have", as the Internet Archive kept it on 2022-10-01, last changed on 2021-06-12. 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).

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