delphi - Circular reference between class -


i need develop next diagram class: enter image description here
wrote code, but, have problems of circular unit reference.

the xmlfilemanager class contains:

unit xmlfilemanager; interface uses   xmldom, xmlintf, msxmldom, xmldoc, sysutils, dateutils, classes, dialogs,   xmlenpmanager; type   txmlfilemanager = class   private     [...]     xmenp: txmlenpmanager;     xmenpinicial: txmlenpmanager;     xmenpfinal: txmlenpmanager; [...] end.

the abstract class, xmlnodemanager:

unit xmlnodemanager; interface uses   xmldom, xmlintf, msxmldom, xmldoc, sysutils, dateutils, classes, dialogs,   xmlfilemanager; type   txmlnodemanager = class    protected         { sgy alias para strategy }         sgyiterator: integer;         sgycontext: txmlfilemanager;         sgyattributes: tstringlist;         sgynode: ixmlnode; [...] end.

and xmlenpmanager concrete class:

unit xmlenpmanager; interface uses   xmldom, xmlintf, msxmldom, xmldoc, sysutils, dateutils, classes, dialogs,   xmlnodemanager; type   txmlenpmanager = class (txmlnodemanager)     public         constructor create(acontext: txmlfilemanager); overload; override;         constructor createinicial(acontext: txmlfilemanager); reintroduce; overload;         constructor createfinal(acontext: txmlfilemanager); reintroduce; overload; [...] end.

the builds fails error:

[dcc32 fatal error] xmlnodemanager.pas(7): f2047 circular unit reference 'xmlfilemanager'

any ideas how solve problem ?.

put txmlfilemanager , txmlnodemanager in both same unit , same type section, make sure type section starts class forward: txmlnodemanager = class;

see official documentation: forward declarations , mutually dependent classes.

unit xmlfilemanagerandxmlnodemanager; interface uses   xmldom, xmlintf, msxmldom, xmldoc, sysutils, dateutils, classes, dialogs, [...]  type   txmlnodemanager = class;    txmlfilemanager = class   private     [...]     xmenp: txmlenpmanager;     xmenpinicial: txmlenpmanager;     xmenpfinal: txmlenpmanager; [...]    txmlnodemanager = class    protected         sgyiterator: integer;         sgycontext: txmlfilemanager;         sgyattributes: tstringlist;         sgynode: ixmlnode; [...] end.

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