[fpc-pascal] Default properties first draft

Ryan Joseph ryan at thealchemistguild.com
Fri Oct 19 17:29:43 CEST 2018


I finally finished what I think is first draft of default properties. Since it already took me so much time to just get the basics of the compiler figured out I thought I’d post this commit from GitHub and ask if I did anything seriously wrong or stupid. There are multiple ways I could approach this problem but I may have not achieved it a proper way considering the architecture of the compiler, which I admittedly don’t understand well.

How should I present for consideration at this stage? If anyone on the compiler team can look at the commit to tell me anything that would be helpful, or let me know if you need this in some other form that you could actually compile (I understand the compiler uses svn but I only know git). I have some demos of the basics mostly working but I have questions/problems I wasn’t able to solve on my own.

https://github.com/genericptr/freepascal/commit/e2992620e2e85d1100f60d13472571b8ebbf0bac

Here’s an example test in case people forgot what this was about.

======================================================================

program default_property_test_16;
uses
	fgl;

type
generic TAuto<T> = record
    m_object: T;
    property obj: T read m_object; default;
    class operator Initialize(var a: TAuto);
    class operator Finalize(var a: TAuto);
  end;

type
  TObjectAuto = specialize TAuto<TObject>;
  TStringList = specialize TFPGList<String>;
  TStringListAuto = specialize TAuto<TStringList>;

class operator TAuto.Initialize(var a: TAuto);
begin
  a.m_object := T.Create;
end;

class operator TAuto.Finalize(var a: TAuto);
begin
  a.m_object.Free;
end;

var
	list: TStringListAuto;
	str: string;
	i: integer;
begin
	list.Add('foo');
	list.Add('bar');
	for str in list do
		writeln(str);
	for i := 0 to list.count - 1 do
		writeln(list[i]);
end.

Regards,
	Ryan Joseph



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