c++ - Can't create QList with custom class -


i'm trying create qlist of custom class objects, got error:

error: c2923: 'qlist' : 'read' not valid template type argument parameter 't'

my code (user header):

#ifndef user_h #define user_h  #include <qstring> #include <qlist> #include "read.h"  class user { protected:     int id;     qstring username;     qstring password;     qlist<read> readbooks;     bool accountdeleted;     bool admin; public:     user();     user(int id, qstring username, qstring password,          qlist<read> readbooks, bool accountdeleted, bool admin);     ~user();     const int getid();     void setid(int id);     const qstring getusername();     void setusername(qstring username);     const qstring getpassword();     void setpassword(qstring password);     const qlist<read> getreadbooks();     void setreadbooks(qlist<read> readbooks);     const bool isaccountdeleted();     void setaccountdeleted(bool accountdeleted);     const bool isadmin();     void setadmin(bool admin); };  qdatastream &operator<<(qdatastream &out, const user &user); qdatastream &operator>>(qdatastream &in, user &user);  #endif // user_h

and qt gives me error list:

...\user.h(13) : error c2065: 'read' : undeclared identifier ...\user.h(13) : error c2923: 'qlist' : 'read' not valid template type argument parameter 't' ...\user.h(18) : error c2065: 'read' : undeclared identifier ...\user.h(18) : error c2923: 'qlist' : 'read' not valid template type argument parameter 't' ...\user.h(27) : error c2065: 'read' : undeclared identifier ...\user.h(27) : error c2923: 'qlist' : 'read' not valid template type argument parameter 't' ...\user.h(28) : error c2065: 'read' : undeclared identifier ...\user.h(28) : error c2923: 'qlist' : 'read' not valid template type argument parameter 't'

read header: 

#ifndef read_h #define read_h  #include <qdatastream> #include "book.h" #include "date.h"  class read { protected:     //book book;     date adddate;     date readdate;     bool stillreading; public:     read();     ~read();     //read(book book, date adddate, date readdate, bool stillreading);     //book getbook();     //void setbook(book book);     date getadddate();     void setadddate(date adddate);     date getreaddate();     void setreaddate(date readdate);     bool isstillreading();     void setstillreading(bool stillreading); };  qdatastream &operator<<(qdatastream &out, const read &read); qdatastream &operator>>(qdatastream &in, read &read);  #endif // read_h

book commented, because gives errors too...

...\user.h(13) : error c2065: 'read' : undeclared identifier

looks read not known in user.h. maybe date.h or book.h including user.h well? (circular references)

using prototype classes can prevent this.


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