asked on

Making a procedure/function private to a unit

Hi,

I have two procedures in a unit, one I want to be available outside the unit (public) and the other should only be available to the unit itself (private). The code below demonstates what I am trying to do, but it won't compile. PrivateProc is called by PublicProc and should only be private. If I move the "procedure PrivateProc;" declaration to the interface section, it will compile, however PrivateProc no longer is private anymore. What do I need to do?

Thanks in Advance,

Richard

Here is the code...

unit Unit2;

interface

procedure PublicProc;

implementation

uses
Dialogs;

procedure PrivateProc;

procedure PublicProc;
begin
ShowMessage('PublicProc');
PrivateProc;
end;

procedure PrivateProc;
begin
ShowMessage('PrivateProc');
end;

end.

DrDelphi

implement the "private" procedure before the published one. For example:

interface
uses dialogs,forms,sysutils;

Procedure Foo; /// available to all

implementation

Procedure Bar; // internal to this unit
begin
Showmessage(TimeTostr(now));
end;

Procedure Foo; /// implementation of prototyped procedure
begin
Bar;
end;

Good luck!!

Kelmi

You cannot declare private procedures at the start of the implementation section, so you need to write your private procedures before you call them. DrDelphi already wrote an example.

---

unit Unit2;

interface

procedure PublicProc;

implementation

uses
Dialogs;

procedure PrivateProc; // This line causes the compilation error, so get rid of it

procedure PublicProc;
begin
ShowMessage('PublicProc');
PrivateProc;
end;

procedure PrivateProc; // Write this before you call it from the PublicProc
begin
ShowMessage('PrivateProc');
end;

end.
---

ASKER CERTIFIED SOLUTION

TOndrej

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial