[fpc-pascal] Re: variables in class, class variables and fields

[Paul Ishenin]

06.11.2010 22:16, ik wrote:
> why not something like this:
>
> TAClass = class
> private
>   FField : class integer;
> end;
"var" and "class var" starts new sections in the class declaration. 
Therefore you can define several class fields or instance fields after them.

For example
TAClass = class
private
   class var
     Field1: Integer;
     Field2: String;
   var
     Field3: Integer;
     Field4: String;
end;

> Further more, what is the difference between a "normal" field and a 
> variable inside a class:
>
> TAClass = class
> private
>   var Variable : Integer;
> end;

var - you start a fields section
Variable : Integer;  - you declare a field inside this section.

You can skip "var" in this case. But if you previosly had "const" or 
"type" section or had a method/property declaration and want to declare 
a field again then you need to explicitly start a field section by "var" 
keyword.

For example:

TAClass = class
private
   type
      TMyInt = type integer;
   var // this keyword is required here
     Field1: TMyInt;
end;

Best regards,
Paul Ishenin.