Question

I have a unit which is the part of several modules(dll, applications).

In some of them I need to use in that module their classes.

Is it possible to use compiler directives (or other methods) to include the unit to the file in case it is included in the project?

Thanks!

Answer 1

If I understood you correctly, the answer is yes. You can use a conditional define in the uses clause:

uses
{$IFDEF USE_MYSTUFF}
  MyUnit,
{$ENDIF}
  Classes, Windows;

and then define (or not) a conditional define USE_MYSTUFF in the project options.

See also $IFDEF, $DEFINE and $INCLUDE directives and Conditional Compilation.