Restricted Class Declaration (RCD)

Description:

RCD detects classes that cannot be used by their supposed clients. Such classes are:

• public classes that do not contain public members and public or protected constructors. In spite of the public access, such classes cannot be used outside of the declaring assembly. This check is performed when the option Check public classes is set.
• Non-instantiable classes that do not contain non-private static members. Such classes cannot be used by any other class. This check is performed when the option Check non-instantiable classes is set.
• non-public classes that contain public constructors. Such classes cannot be instantiated outside of the declaring assembly. This check is performed when the option Check non-public classes is set.

Incorrect:

MyProperty = class
  private
    constructor Create(id:String);
    function getValue():TObject;
    procedure setValue(val:TObject);
end;

Correct:

MyProperty = class
  public
    constructor Create(id:String);
    function getValue():TObject;
    procedure setValue(val:TObject);
end;