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

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

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