Error Lnk2019 Template Function
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Error Lnk2019 Unresolved External Symbol Winmain@16 Referenced In Function ___tmaincrtstartup
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Error Lnk2019 Unresolved External Symbol _main Referenced In Function ___tmaincrtstartup
[template class's constructor and destructor] referenced in function _main up vote 12 down vote favorite 7 [[UPDATE]] -> If I #include "Queue.cpp" in my program.cpp, it works just fine. This shouldn't be necessary, right? Hey all -- I'm using Visual Studio 2010 and having trouble linking a quick-and-dirty Queue implementation. I started with an empty Win32 Console Application, and all files are present in the project. For error lnk2019 unresolved external symbol public __thiscall referenced in function _main verbosity, here's the complete code to duplicate my error. I realize some of the code may, in fact, be wrong. I haven't had a chance to test it yet because I haven't yet been able to link it. Queue.hpp #ifndef ERROR_CODE #define ERROR_CODE enum Error_Code { Success, Underflow, Overflow }; #endif // ERROR_CODE #ifndef QUEUE #define QUEUE template struct Queue_Node { T data; Queue_Node *next; Queue_Node() { next = NULL; } Queue_Node(T pData) { data = pData; next = NULL; } Queue_Node(T pData, Queue_Node *pNext) { data = pData; next = pNext; } }; template class Queue { public: Queue(); Error_Code Serve(); Error_Code Append(T item); T Front(); ~Queue(); private: void Rescursive_Destroy(Queue_Node *entry); Queue_Node *front, *rear; }; #endif // QUEUE Queue.cpp #include "Queue.hpp" template Queue::Queue() { this->front = this->rear = NULL; } template Error_Code Queue::Serve() { if(front == NULL) return Underflow; Queue_Node *temp = this->front; this->front = this->front->next; delete temp; } template Error_Code Queue::Append(T item) { Queue_Node *temp = new Queue_Node(item); if(!temp) return Overflow; if(this->rear != NULL) this->rear->next = temp; this->rear = temp; return Success; } template T Queue::Front() { if(this->front == NULL) return Underflow; return this->front->data; } template Queue::~Queue() { this->Rescursive_Dest
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Error Lnk2019 Unresolved External Symbol Main Referenced In Function __tmaincrtstartup
About Us Learn more about Stack Overflow the company Business Learn more about c++ error lnk2019 unresolved external symbol _main referenced in function ___tmaincrtstartup hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss error lnk2019 unresolved external symbol visual studio 2010 Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up “error LNK2019: unresolved external http://stackoverflow.com/questions/3705740/c-lnk2019-error-unresolved-external-symbol-template-classs-constructor-and symbol” when using templates [duplicate] up vote 1 down vote favorite Possible Duplicate: Why do I get “unresolved external symbol” errors when using templates? I am using templates in my code while there is always an error LNK2019. Here is part of my code: Method.h template void Method(Model* sys); Method.cpp template void Method(Model* sys){ blablabla;} Model.h template class Model{ blablabla;} class Model1:public http://stackoverflow.com/questions/11512674/error-lnk2019-unresolved-external-symbol-when-using-templates Model{ blablabla;} Main.cpp Model *sys=new Model1(); Method(sys); However, there always shows an error LNK2019: unresolved external symbol "void __cdec1 Method(class Model*)" referenced in function_main. Anyone knows where I am going wrong? Thanks a lot! c++ templates share|improve this question edited Jul 16 '12 at 21:37 iKlsR 1,56041737 asked Jul 16 '12 at 21:15 Mark Z. 1521511 marked as duplicate by Bo Persson, George Stocker♦ Jul 18 '12 at 2:25 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. 1 Put implementations in the header... –Luchian Grigore Jul 16 '12 at 21:17 Most of the questions here with this "issue" are named like this: "unresolved external symbol bla-bla-bla templates".. And all of them will come up as suggestions, while you're typing the title of your question. Just pay attention! –Kiril Kirov Jul 16 '12 at 21:33 I noticed your'e new to SO. Do you know how to accept answers? –Drise Jul 17 '12 at 13:55 add a comment| 3 Answers 3 active oldest votes up vote 13 down vote accepted Templates should
Studio Languages , Windows Desktop Development > Visual C++ Question 0 Sign in to vote Hi everyone, I have https://social.msdn.microsoft.com/Forums/vstudio/en-US/0d613b65-52ac-4fb7-bf65-8a543dfbcc6e/visual-c-error-lnk2019-unresolved-external-symbol?forum=vcgeneral encountered a linking error when testing the following code, whichis contained infour files: 1) File "A.h" #pragma once template class A {public: void f(T);}; http://www.dreamincode.net/forums/topic/369306-error-lnk2019-unresolved-external-symbol-referenced-in-function-main/ 2) File "A.cpp" #include "A.h" template void A::f(T x){} 3) File "B.h" #pragma once #include "A.h" class B {public: A error lnk2019 z; void g(int);}; 4) File "B.cpp" #include "B.h" void B::g(int n) {z.f(n);} void main( void) {} The error I got is: error LNK2019: unresolved external symbol "public: void __thiscall A::f(int)" (?f@?$A@H@@QAEXH@Z) referenced in function "public: void __thiscall B::g(int)" (?g@B@@QAEXH@Z) However, if I put all the code in one file test.cpp, there isNO lnk2019 unresolved external linking problem at all. Here is the content of my test.cpp file: template class A {public: void f(T);}; template void A::f(T x){} class B {public: A z; void g(int);}; void B::g(int n) {z.f(n);} void main( void) {} I am really confused by these results and have no clue on what I did wrong. Both should be working, right? I hope to get your expert opinion on this case. Many thanks for your help in advance. -ggbeh000 Tuesday, August 30, 2011 7:05 PM Reply | Quote Answers 1 Sign in to vote I hope these links will be helpful: http://www.comeaucomputing.com/techtalk/templates/#whylinkerror http://en.wikipedia.org/wiki/Template_metaprogramming#Compile-time_class_generation http://msdn.microsoft.com/en-us/library/7y5ca42y%28v=VS.100%29.aspx http://msdn.microsoft.com/en-us/library/by56e477.aspx btw, in your sample, make A::f(T x) virtual an you won't get the error, but: the error will occur when you instantiate a B ;-) read the linked articles and it will be clear I think "It's time to kick ass and chew bubble gum... and I'm all outta gum." - Duke Nukem M
function _main Page 1 of 1 New Topic/Question Reply 8 Replies - 3860 Views - Last Post: 27 January 2015 - 03:49 PM Rate Topic: #1 jedichris816 New D.I.C Head Reputation: 0 Posts: 5 Joined: 13-October 14 error LNK2019: unresolved external symbol referenced in function _main Posted 27 January 2015 - 02:22 PM My issue is that I don't understand the meaning of the error LNK2019. I'm trying to get a single piece of my assignment working before I start getting the next piece working. Here's the error: 1>------ Rebuild All started: Project: MinMax, Configuration: Debug Win32 ------ 1> MinMax.cpp 1>MinMax.obj : error LNK2019: unresolved external symbol "public: __thiscall MinMax::MinMax(void)" (??0?$[emailprotected]@@[emailprotected]) referenced in function _main 1>MinMax.obj : error LNK2019: unresolved external symbol "public: int const __thiscall MinMax::getMinimum(void)" (?getMinimum@?$[emailprotected]@@QAE?BHXZ) referenced in function _main 1>MinMax.obj : error LNK2019: unresolved external symbol "public: int const __thiscall MinMax::getMaximum(void)" (?getMaximum@?$[emailprotected]@@QAE?BHXZ) referenced in function _main 1>C:\Users\Christopher\Google Drive\C++ workspace\CIS 243 Programs\week 3\MinMax\Debug\MinMax.exe : fatal error LNK1120: 3 unresolved externals ========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ========== Code is below MinMax.h: #ifndef MINMAX_M #define MINMAX_M #include #include using namespace std; template class MinMax { //private: //NOT EVEN SURE IF I NEED THIS PRIVATE CRAP //const int a = 5; //const int b = 8; //const double c = 10; //const double d = 3; //const char e = k; // char e is equal to the value of k //const char f = x; // char f is equal to the value of x public: MinMax (); const int getMinimum (); const int getMaximum (); const double getMinimum2 (); const double getMaximum2 (); const char getMinimum3 (); const char getMaximum3 (); }; template const int getMinimum () { a = 5; b = 8; return(a > b ? a : B)/>/>/>; } template const int getMaximum () { c = 10; d = 3; return(c > d ? c : d); } #endif and the class file, MinMax.cpp: #include #include #include "MinMax.h" using namespace std; int main () { MinMax obj1; cout << "The smaller of the two values is: " << obj1.getMinimum () << endl << endl; cout << "The l