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class variables and static fields
Zoran:
Since FPC 2.6 class fields can be declared this way (as documented in this wiki page):
--- Code: ---type
TSomeClass = class
public
class var
FSomeClassVar: TSomeType;
end;
--- End code ---
In this example variable FSomeClassVar is allocated globally (just one variable exists per class, not per class instance), and it can be accessed through class name (TSomeClass.FSomeClassVar).
In fpc documentation, I didn't find anything about these class variables.
However, in Reference guide, I found about static fields. Although Reference guide mentions these in chapter about old tp style objects, I tried and this syntax works in classes.
My question is - are there any differences between these two? Are these static fields and class vars actually same thing?
Leledumbo:
--- Quote ---are there any differences between these two? Are these static fields and class vars actually same thing?
--- End quote ---
http://docwiki.embarcadero.com/RADStudio/XE5/en/Methods#Class_Static_Methods
Zoran:
--- Quote from: Leledumbo on February 21, 2014, 11:58:22 pm ---
--- Quote ---are there any differences between these two? Are these static fields and class vars actually same thing?
--- End quote ---
http://docwiki.embarcadero.com/RADStudio/XE5/en/Methods#Class_Static_Methods
--- End quote ---
Thanks, Leledumbo, for trying to help, but this link says nothing about what I asked. It doesn't even talk about fields, but about methods.
However, starting from your link, I jumped to the article about fields, where class fields in Delphi are mentioned. Still, there is nothing about static fields, so my question is still without answer.
engkin:
--- Quote from: Zoran on February 21, 2014, 03:59:04 pm ---My question is - ... Are these static fields and class vars actually same thing?
--- End quote ---
Yes. Based on a comment in the source code, class var is a section where all fields inside it are static, while static directive is used for one single field.
--- Quote from: compiler\pdecvar.pas --- procedure read_record_fields(options:Tvar_dec_options; reorderlist: TFPObjectList; variantdesc : ppvariantrecdesc);
...
{ if it is not a class var section and token=STATIC then it is a class field too }
--- End quote ---
Zoran:
Thank you, so these are same.
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