Linker Error in derived class initialization

Please support our C++ advertiser: Programming Forums - DaniWeb Sister Site
Reply

•
•
Join Date: Jun 2005
Posts: 62
Reputation: freemind is an unknown quantity at this point 
Solved Threads: 1
freemind's Avatar
freemind freemind is offline Offline
Junior Poster in Training

Linker Error in derived class initialization

 
0
  #1
Jul 31st, 2005
Here I paste a simple address book/telephone book. The linker spits the following error:
g++.exe derived2.o -o "Derived2.exe" -L"C:/Dev-Cpp/lib"
derived2.o(.text$_ZN2ABD2Ev[AB::~AB()]+0x3a):derived2.cpp: undefined reference to `vtable for AB'
derived2.o(.text$_ZN2ABC2ESsSsSs[AB::AB(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >)]+0x3d):derived2.cpp: undefined reference to `vtable for AB'
collect2: ld returned 1 exit status
make.exe: *** [Derived2.exe] Error 1
Execution terminated

I would be thankful for ideas on what is wrong..

C++ Syntax (Toggle Plain Text) 
  1.  
  2. #include <iostream>
  3. #include <string>
  4. #include <map>
  5. #include <list>
  6. using namespace std; 
  7. class TelB;
  8. class AB {									  // Address Book
  9. 	  protected:
  10. 				string name;
  11. 				string address;
  12. 				string land;
  13. 	  public:
  14. 				virtual void add(list<TelB*>&);
  15. 				virtual void del(list<TelB*>&);
  16. 				virtual void show() const {
  17. 						cout << "\n Name: " << name << "\n Address: " << address;
  18. 						cout << "\n Land: " << land;
  19. 				};
  20. 				AB(string n, string a, string l){
  21. 							 name = (string) n;
  22. 							 address = (string) a;
  23. 							 land = (string) l;
  24. 				}
  25. 				virtual ~AB(){};
  26. };
  27. class TelB : public AB {					   // Telephone Book
  28. 	  private:
  29. 			  string number;
  30. 			  enum Type { Mobile = 1, Static = 2 };
  31. 			  Type Tel_type;
  32. 	  public:
  33. 			 virtual void add(list<TelB*>&);
  34. 			 virtual void del(list<TelB*>&);
  35. 			 virtual void show() const;
  36. 			 TelB(string n, string a, string l, string num, int type)
  37. 						 :AB(n, a, l) {
  38.  
  39. 						 string tmp;
  40. 						 string MobileBG = "888", MobileDE = "177";
  41. 						 string StaticBG = "00359", StaticDE = "0049";
  42.  
  43. 						 // Adding pre-dial stuff for the numbers(for convenience)
  44. 						 if(l == "Bulgaria")
  45. 								 if(type == 1)
  46. 											   tmp = StaticBG + MobileBG;
  47. 								 else
  48. 											   tmp = StaticBG;
  49. 						 if(l == "Germany")
  50. 								 if(type == 1)
  51. 											   tmp = StaticDE + MobileDE;
  52. 								 else
  53. 											   tmp = StaticDE;
  54.  
  55. 						 number = tmp + " / " + num;
  56. 			 }
  57. 			 virtual ~TelB(){};
  58. };
  59. void TelB::add(list<TelB*>& PB) {
  60. 	 string n, a, l, num;
  61. 	 short t;
  62.  
  63. 	 cout << "\n Please input name: "; cin >> n;
  64. 	 cout << "\n Please input address: "; cin >> a;
  65. 	 cout << "\n Please input land(Bulgaria or Germany)?: "; cin >> l;
  66. 	 cout << "\n Please input number: "; cin >> num;
  67. 	 cout << "\n What type of phone is this(1 - Mobile, 2 - Static): "; cin >> t;
  68.  
  69. 	 TelB* new_entry = new TelB(n, a, l, num, (Type) t);
  70. 	 PB.push_front(new_entry);
  71. 	 delete new_entry;
  72. }
  73. void TelB::show() const {
  74. 	 AB::show();
  75. 	 cout << "\n Number: " << number;
  76. 	 cout << "\n Phone type: " << Tel_type;
  77. }
  78. void TelB::del(list<TelB*>& PB){
  79. 	 cout << "\n Please input an entry number to be removed: ";
  80. 	 long n, j=0;
  81. 	 cin >> n;
  82. 	 for(list<TelB*>::iterator I=PB.begin(); ;++I) {
  83. 			 j++;
  84. 			 if(n == j) {
  85. 				  PB.erase(I);
  86. 				  cout << "\n Entry deleted.\n";
  87. 				  break;
  88. 			 }
  89. 			 if(I==PB.end()) {
  90. 				  cout << "\n No such entry found...\n";
  91. 				  break;
  92. 			 }
  93. 	 }
  94. }
  95. short printmenu(void) {
  96. 	  cout << "\n\n\n";
  97. 	  cout << "\n 1. Add to phone book";
  98. 	  cout << "\n 2. Delete from phone book";
  99. 	  cout << "\n 3. Show entries";
  100. 	  cout << "\n 4. Quit";
  101. 	  cout << "\n Your Choice?: ";
  102.  
  103. 	  short choice;
  104. 	  cin >> choice;
  105.  
  106. 	  return choice;
  107. }
  108. void print_list(list<TelB*>& w) {
  109. 	 long j=0;
  110. 	 for(list<TelB*>::const_iterator I=w.begin(); I!=w.end(); ++I) {
  111. 			  j++; (*I)->show();
  112. 			  cout << "\n Entry number: " << j << endl;
  113. 	 }
  114. }
  115. int main(void) {
  116.  
  117. 	TelB Default("Me", "Some Address", "Bulgaria", "777877", 2);
  118. 	list<TelB*> Phone_book;
  119.  
  120. 	for(;;) {
  121. 				switch(printmenu()) {
  122. 						case 1: Default.add(Phone_book);
  123. 							 break;
  124. 						case 2: Default.del(Phone_book);
  125. 							 break;
  126. 						case 3: print_list(Phone_book);
  127. 							 break;
  128. 						case 4: return 1;
  129. 							 break;
  130. 						default: cout << "\n Please choose a number from 1 to 4 for your "
  131. 									  << "corresponding choice." << endl;
  132. 							  break;
  133. 				}
  134. 	}
  135.  
  136. 	return 0;
  137. }

Thanks!
Reply With Quote Quick reply to this message  
•
•
Join Date: Sep 2004
Posts: 7,868
Reputation: Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute Narue has a reputation beyond repute 
Solved Threads: 755
Team Colleague
Narue's Avatar
Narue Narue is offline Offline
Senior Bitch

Re: Linker Error in derived class initialization

 
0
  #2
Jul 31st, 2005
These two member functions are not defined:
C++ Syntax (Toggle Plain Text) 
  1. virtual void add(list<TelB*>&);
  2. virtual void del(list<TelB*>&);
You need to either provide them with a body, or make them pure.
New members chased away this month: 5
Reply With Quote Quick reply to this message  
•
•
Join Date: Jun 2005
Posts: 62
Reputation: freemind is an unknown quantity at this point 
Solved Threads: 1
freemind's Avatar
freemind freemind is offline Offline
Junior Poster in Training

Re: Linker Error in derived class initialization

 
0
  #3
Jul 31st, 2005
Thanks.
Get's the job done but crashes when the list has to be shown. Since there is nothing specific about showing it I consider a possible error when adding an entry. This is only an asumption, though, but I am not quite sure if this
C++ Syntax (Toggle Plain Text) 
  1.  
  2.  
  3. 	 TelB* new_entry = new TelB(n, a, l, num, t);
  4. 	 PB.push_front(new_entry);
  5. 	 delete new_entry;

is correct. Isn't it pushing_front a wrong thing ? Since devcpp for unknown reason does't want to add debugging information to the project I can't try to debug it. So.. I ask
Reply With Quote Quick reply to this message  
•
•
Join Date: Jun 2005
Posts: 62
Reputation: freemind is an unknown quantity at this point 
Solved Threads: 1
freemind's Avatar
freemind freemind is offline Offline
Junior Poster in Training

Re: Linker Error in derived class initialization

 
0
  #4
Jul 31st, 2005
I withdraw the last question. Sorry for the delay. Just changed list<TelB*> to list<TelB> and added some changes on 1-2 places. Now it works correctly. Sorry if I have taken from somebody's time!
Reply With Quote Quick reply to this message  
•
•
Join Date: Jun 2005
Posts: 62
Reputation: freemind is an unknown quantity at this point 
Solved Threads: 1
freemind's Avatar
freemind freemind is offline Offline
Junior Poster in Training

Re: Linker Error in derived class initialization

 
0
  #5
Jul 31st, 2005
Here I paste the edited and fully working code in case somebody is interested in it.

C++ Syntax (Toggle Plain Text) 
  1.  
  2.  
  3. #include <iostream>
  4. #include <string>
  5. #include <list>
  6.  
  7. using namespace std; 
  8.  
  9. static const char* lala[] = {"Mobile", "Static"};
  10.  
  11. class TelB;
  12. class AB {									  // Address Book
  13. 	  protected:
  14. 				string name;
  15. 				string address;
  16. 				string land;
  17. 	  public:
  18. 				virtual void add(list<TelB>&) = 0;
  19. 				virtual void del(list<TelB>&) = 0;
  20. 				virtual void show() const {
  21. 						cout << "\n Name: " << name << "\n Address: " << address;
  22. 						cout << "\n Land: " << land;
  23. 				};
  24. 				AB(string n, string a, string l){
  25. 							 name = (string) n;
  26. 							 address = (string) a;
  27. 							 land = (string) l;
  28. 				}
  29. 				virtual ~AB(){};
  30. };
  31.  
  32. class TelB : public AB {					   // Telephone Book
  33. 	  private:
  34. 			  string number;
  35. 			  enum Type { Mobile = 1, Static = 2 };
  36. 			  Type Tel_type;
  37. 	  public:
  38. 			 virtual void add(list<TelB>&);
  39. 			 virtual void del(list<TelB>&);
  40. 			 virtual void show() const;
  41. 			 TelB(string n, string a, string l, string num, int type)
  42. 						 :AB(n, a, l) {
  43.  
  44. 						 string tmp;
  45. 						 string MobileBG = "888", MobileDE = "177";
  46. 						 string StaticBG = "00359", StaticDE = "0049";
  47.  
  48. 						 // Adding pre-dial stuff for the numbers(for convenience)
  49. 						 if(l == "Bulgaria")
  50. 								 if(type == 1)
  51. 											   tmp = StaticBG + MobileBG;
  52. 								 else
  53. 											   tmp = StaticBG;
  54. 						 if(l == "Germany")
  55. 								 if(type == 1)
  56. 											   tmp = StaticDE + MobileDE;
  57. 								 else
  58. 											   tmp = StaticDE;
  59.  
  60. 						 number = tmp + " / " + num;
  61. 						 Tel_type = (Type) type;
  62. 			 }
  63. 			 virtual ~TelB(){};
  64. };
  65.  
  66. void TelB::add(list<TelB>& PB) {
  67. 	 string n, a, l, num;
  68. 	 short t;
  69.  
  70. 	 cout << "\n Please input name: "; cin >> n;
  71. 	 cout << "\n Please input address: "; cin >> a;
  72. 	 cout << "\n Please input land(Bulgaria or Germany)?: "; cin >> l;
  73. 	 cout << "\n Please input number: "; cin >> num;
  74. 	 cout << "\n What type of phone is this(1 - Mobile, 2 - Static): "; cin >> t;
  75.  
  76. 	 TelB* new_entry = new TelB(n, a, l, num, t);
  77. 	 PB.push_front(*new_entry);
  78. 	 delete new_entry;
  79. }
  80.  
  81. void TelB::show() const {
  82. 	 AB::show();
  83. 	 cout << "\n Number: " << number;
  84. 	 cout << "\n Phone type: " << lala[(int)Tel_type-1];
  85. }
  86.  
  87. void TelB::del(list<TelB>& PB){
  88. 	 cout << "\n Please input an entry number to be removed: ";
  89. 	 long n, j=0;
  90. 	 cin >> n;
  91. 	 for(list<TelB>::iterator I=PB.begin(); ;++I) {
  92. 			 j++;
  93. 			 if(n == j) {
  94. 				  PB.erase(I);
  95. 				  cout << "\n Entry deleted.\n";
  96. 				  break;
  97. 			 }
  98. 			 if(I==PB.end()) {
  99. 				  cout << "\n No such entry found...\n";
  100. 				  break;
  101. 			 }
  102. 	 }
  103. }
  104.  
  105. short printmenu(void) {
  106. 	  cout << "\n\n\n";
  107. 	  cout << "\n 1. Add to phone book";
  108. 	  cout << "\n 2. Delete from phone book";
  109. 	  cout << "\n 3. Show entries";
  110. 	  cout << "\n 4. Quit";
  111. 	  cout << "\n Your Choice?: ";
  112.  
  113. 	  short choice;
  114. 	  cin >> choice;
  115.  
  116. 	  return choice;
  117. }
  118.  
  119. void print_list(list<TelB>& w) {
  120. 	 long j=0;
  121. 	 for(list<TelB>::const_iterator I=w.begin(); I!=w.end(); ++I) {
  122. 			  j++; (I)->show();
  123. 			  cout << "\n Entry number: " << j << endl;
  124. 	 }
  125. }
  126.  
  127. int main(void) {
  128.  
  129. 	TelB Default("Me", "Some Address", "Bulgaria", "777877", 2);
  130. 	list<TelB> Phone_book;
  131.  
  132. 	for(;;) {
  133. 				switch(printmenu()) {
  134. 						case 1: Default.add(Phone_book);
  135. 							 break;
  136. 						case 2: Default.del(Phone_book);
  137. 							 break;
  138. 						case 3: print_list(Phone_book);
  139. 							 break;
  140. 						case 4: return 1;
  141. 							 break;
  142. 						default: cout << "\n Please choose a number from 1 to 4 for your "
  143. 									  << "corresponding choice." << endl;
  144. 							  break;
  145. 				}
  146. 	}
  147.  
  148. 	return 0;
  149. }
Reply With Quote Quick reply to this message  
Reply

Quick Reply to Thread
This thread is more than three months old.
Perhaps start a new thread instead?
•
•
•
•
•
•
•
•
Message:
•
•
•
•



Similar Threads
Other Threads in the C++ Forum


Views: 2688 | Replies: 4
Thread Tools Search this Thread



Tag cloud for C++
6 api application array arrays based beginner binary c++ c/c++ calculator char char* class classes code coding compile compiler console conversion convert count data database delete developer display dll dynamiccharacterarray email encryption error file format forms fstream function functions game generator givemetehcodez graph iamthwee ifstream image input int java lib list loop looping loops map math matrix memory multiple newbie news number numbertoword output pointer problem program programming project python random read recursion recursive reference return rpg search simple sort sorting spoonfeeding string strings struct template templates text tree url variable vector video visual visualstudio win32 windows winsock wordfrequency wxwidgets
About Us | Contact Us | Advertise | DaniWeb | Acceptable Use Policy | RSS Feed

©2003 - 2009 DaniWeb® LLC