c++ - LNK2019: the object file of my main class cannot find the definition of a class i declared and defined -

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so have lnk2019 error on constructor , destructor of class classifier. error exists on method classify. see, defined in .cpp file. overlooking?

here 3 errors: neutropenia_main.obj:-1: error: lnk2019: unresolved external symbol "public: __cdecl classifier::classifier(class qobject *)" (??0classifier@@qeaa@peavqobject@@@z) referenced in function "private: void __cdecl neutropenia_main::on_ts_classifier_clicked(void)" (?on_ts_classifier_clicked@neutropenia_main@@aeaaxxz)

neutropenia_main.obj:-1: error: lnk2019: unresolved external symbol "public: virtual __cdecl classifier::~classifier(void)" (??1classifier@@ueaa@xz) referenced in function "private: void __cdecl neutropenia_main::on_ts_classifier_clicked(void)" (?on_ts_classifier_clicked@neutropenia_main@@aeaaxxz)

neutropenia_main.obj:-1: error: lnk2019: unresolved external symbol "public: void __cdecl classifier::classify(class std::vector >,class patient_data)" (?classify@classifier@@qeaaxv?$vector@vpatient_data@@v?$allocator@vpatient_data@@@std@@@std@@vpatient_data@@@z) referenced in function "private: void __cdecl neutropenia_main::on_ts_classifier_clicked(void)" (?on_ts_classifier_clicked@neutropenia_main@@aeaaxxz)

here use of class classifier.

#include "neutropenia_main.h" #include "ui_neutropenia_main.h" #include "qobject" #include "xlsxdocument.h" #include "xlsxworksheet.h" #include "xlsxworkbook.h" #include "qtcore" #include "xlsxcell.h" #include "xlsxcellrange.h" #include "xlsxcellreference.h" #include "patient_data.h" #include <vector> #include <stdlib.h> #include "classifier.h" #include <qwidget>  void neutropenia_main::on_ts_classifier_clicked() {     int bottomrow = bottomleft.row();     ui ->classification_table->setrowcount(bottomrow);     ui ->classification_table->setcolumncount(3);      classifier cl;      qstringlist headers;     headers << "patient number" << "classification" << "actual";      int = 0;      qvariant case;     qvariant classified;     qvariant actual;      (auto current: patients)     {         if (current.getvalid())         {    cl.classify(patients,current);              case = current.getcasenumber();             ui -> classification_table -> setitem(i,0,new qtablewidgetitem(case.tostring()));             ui -> classification_table -> setitem(i,2,new qtablewidgetitem(current.stringneut(current.getneut())));             if (cl.currentvsneutropenic.sd[0] < cl.currentvsnonneutropenic.sd[0])             {                 ui -> classification_table ->setitem(i,1,new qtablewidgetitem("yes"));                  classified = "yes";             }else if (cl.currentvsnonneutropenic.sd[0] > cl.currentvsnonneutropenic.sd[0])             {                 ui -> classification_table -> setitem(i,1,new qtablewidgetitem("no"));                  classified = "no";             }else{                  classified = "same sd";                 ui -> classification_table -> setitem (i,1,new qtablewidgetitem("same sd"));             }         }         classifiedpatients temp;         temp.case = case;         temp.classifed = classified;         temp.actual = current.stringneut(current.getneut());          classified.push_back(temp);     } }  here .h file of classifier #ifndef classifier_h #define classifier_h  #include "patient_data.h" #include <qobject> #include <vector> #include <stdlib.h>  class classifier : public qobject {     q_object public:     explicit classifier(qobject *parent = 0);     ~classifier();     void classify(std::vector<patient_data>data, patient_data i);       struct createsdtable     {         std::vector<int>sum[3];   //element 0 = tumor, element 1 = stage, element 2 = adjuvant         std::vector<long>mean[3];         std::vector<long>error[3];         std::vector<long>sdl[3];         std::vector<long>sd[3];     };      createsdtable currentvsneutropenic;     createsdtable currentvsnonneutropenic;  private:      std::vector<int> calculatesums(std::vector<patient_data> data, patient_data i);     std::vector<long> calculatemean(std::vector<int>validpatients, createsdtable neut, createsdtable nonneut);     std::vector<long>calculateerror(patient_data d, std::vector<int>m);     std::vector<long>calculatsdl(int nvp, createsdtable cvn, createsdtable cvsnn);     int numofvalidpatients(patient_data x);      //void classify(std::vector<patient_data>data, patient_data i);  signals:  public slots:  };  #endif // classifier_h  #include "classifier.h" #include "patient_data.h" #include <vector> #include <stdlib.h> #include <math.h>   classifier::classifier(qobject *parent) :     qobject(parent) { }  void classifier::classify(vector<patient_data> data, patient_data i) {     int numvalidpatients = numofvalidpatients(data);      if (i.getvalid())     {         neutropenic n;          std::vector<long>temp = sums(data,i, n);         while (j < 3){currentvsnonneutropenic.sum[j] = temp[j];}         while(j > 3){currentvsneutropenic.sum[j] = temp[j+3];}          temp = calculatemean(numvalidpatients,currentvsneutropenic,currentvsnonneutropenic);         while (j < 3){currentvsnonneutropenic.mean[j] = temp[j];}         while(j > 3){currentvsneutropenic.mean[j] = temp[j+3];}          temp = calculateerror(data,mean);         while (j < 3){currentvsnonneutropenic.error[j] = temp[j];}         while(j > 3){currentvsneutropenic.error[j] = temp[j+3];}          temp = calculatesdl(numvalidpatients,currentvsneutropenic,currentvsnonneutropenic);         while (j < 3){currentvsnonneutropenic.sdl[j] = temp[j];}         while(j > 3){currentvsneutropenic.sdl[j] = temp[j+3];}     } }


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