Class/Static Constants in Delphi

Question

In Delphi, I want to be able to create an private object that\'s associated with a class, and access it from all instances of that class. In Java, I\'d use:

pub         


        

Answer 1

For what I want to do (a private class constant), the neatest solution that I can come up with (based on responses so far) is:

unit MyObject;

interface

type

TMyObject = class
private
  class var FLogger: TLogLogger;
end;

implementation

initialization
  TMyObject.FLogger:= TLogLogger.GetLogger(TMyObject);
finalization
  // You'd typically want to free the class objects in the finalization block, but
  // TLogLoggers are actually managed by Log4D.

end.

Perhaps a little more object oriented would be something like:

unit MyObject;

interface

type

TMyObject = class
strict private
  class var FLogger: TLogLogger;
private
  class procedure InitClass;
  class procedure FreeClass;
end;

implementation

class procedure TMyObject.InitClass;
begin
  FLogger:= TLogLogger.GetLogger(TMyObject);
end;

class procedure TMyObject.FreeClass;
begin
  // Nothing to do here for a TLogLogger - it's freed by Log4D.
end;

initialization
  TMyObject.InitClass;
finalization
  TMyObject.FreeClass;

end.

That might make more sense if there were multiple such class constants.