Error Lnk2019 Unresolved External Symbol 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
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 C++ keep getting error error lnk2019 unresolved external symbol public void __thiscall referenced in function LNK2019: unresolved external symbol [duplicate] up vote 4 down vote favorite 2 This question already has an answer here: Why can templates only be implemented in the header file? 12 answers I tried to google this but always come back with different issues. I am getting 3 unresolved externals when I try to compile this program: 1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall DynIntStack::~DynIntStack(void)" error lnk2019 unresolved external symbol __declspec(dllimport) (??1?$DynIntStack@D@@QAE@XZ) referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall DynIntStack::pop(char &)" (?pop@?$DynIntStack@D@@QAEXAAD@Z) referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall DynIntStack::push(char)" (?push@?$DynIntStack@D@@QAEXD@Z) referenced in function _main DynIntStack.h /**************************************************************************** DynIntStack class. Chad Peppers This class creates a object for stacking nodes In addition, there should be member functions to perform the following operations: - Push to the stack - Pop to the stack - Function to check if empty ****************************************************************************/ // Specification file for the DynIntStack class #ifndef DYNINTSTACK_H #define DYNINTSTACK_H template class DynIntStack { private: // Structure for stack nodes struct StackNode { T value; // Value in the node StackNode *next; // Pointer to the next node }; StackNode *top; // Pointer to the stack top public: // Constructor DynIntStack() { top = NULL; } // Destructor ~DynIntStack(); // Stack operations void push(T); void pop(T &); bool isEmpty(); }; #endif DynIntStack.cpp /**************************************************************************** DynIntStack class. Chad Peppers This class creates a object for stacking nodes In addition, there should be member functions to perform the following operations: - Push to the stack - Pop to the stack - Function
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C++ Error Lnk2019 Unresolved External Symbol
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Error Lnk2019 Unresolved External Symbol Void __cdecl
x Dismiss 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 Why http://stackoverflow.com/questions/10271796/c-keep-getting-error-lnk2019-unresolved-external-symbol do I get “unresolved external symbol” errors when using templates? [duplicate] up vote 60 down vote favorite 21 This question already has an answer here: Why can templates only be implemented in the header file? 12 answers When I write C++ code for a class using templates and split the code between a source (CPP) file and a header (H) file, I get http://stackoverflow.com/questions/456713/why-do-i-get-unresolved-external-symbol-errors-when-using-templates a whole lot of "unresolved external symbol" errors when it comes to linking the final executible, despite the object file being correctly built and included in the linking. What's happening here, and how can I fix it? c++ templates linker share|improve this question edited Jan 19 '09 at 22:49 asked Jan 19 '09 at 6:29 dlanod 3,99133468 marked as duplicate by Deduplicator, Andrew Medico, Kerrek SB, yizzlez, jaypal singh May 12 '14 at 1:58 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. See also stackoverflow.com/questions/495021/… –sth Sep 7 '13 at 1:41 add a comment| 3 Answers 3 active oldest votes up vote 76 down vote accepted Templated classes and functions are not instantiated until they are used, typically in a separate .cpp file (e.g. the program source). When the template is used, the compiler needs the full code for that function to be able to build the correct function with the appropriate type. However, in this case the code for that function is detailed in the template's source file a
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more http://stackoverflow.com/questions/1569254/lnk2019-and-lnk1120-with-templated-function about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping http://www.cplusplus.com/forum/general/14162/ each other. Join them; it only takes a minute: Sign up LNK2019 and LNK1120 with templated function up vote 0 down vote favorite After having some problems with these two linker errors on SO, I have them again. However, error lnk2019 this time the source seems to lie at another point. compiler error shows that it cannot find a function with signature ""public: unsigned int __thiscall MyClass::myFunction(int)const ". However, moving the contents of myClass.cpp to main.cpp works. Don't know why (all other content of myClass.cpp doesn't have this problem. (other functions are not templated). myClass.h #ifndef X #define X class MyClass { public: template T myFunction (int someArgument) const; }; #endif myClass.cpp #include "myClass.h" template error lnk2019 unresolved T MyClass::myFunction (int someArgument) const { return T(); } main.cpp #include "myClass.h" int main () { MyClass a(); a.myFunction(42); return 0; } What can I do to fix this problem? c++ linker-error share|improve this question asked Oct 14 '09 at 21:59 Etan 6,4191358110 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted Because in main.cpp, the compiler can find the definition of the template function. Templates cannot be compiled, the compiler needs to be able to see the definition of the file, and it's can't see across files. Either include myClass.cpp in myClass.h, or just define everything in the header. share|improve this answer answered Oct 14 '09 at 22:02 GManNickG 231k29346470 add a comment| up vote 2 down vote Function templates have to be defined in header files. Templates of class methods are not an exception to that rule. Move the definition of the method from 'MyClass.cpp' to the header file 'MyClass.h'. myClass.h #ifndef X #define X class MyClass { public: template T myFunction (int someArgument) const; }; template T MyClass::myFunction (int someArgument) const { return T(); } #endif Your 'MyClass.cpp' is not needed at all until the first non-template member of 'MyClass'. share|improve this answer answered Oct 14 '09 at 22:01 AnT 202k25292524 add a comment| Your Answer draft saved draft discarded Sign up or log in Si
error LNK2019: unresolved external symbol "public: __thiscall cServer::cServer(class cUser4Login &)" (??0?$cServer@GVcUser4Login@@@@QAE@AAVcUser4Login@@@Z) referenced in function "public: __thiscall cLoginServer::cLoginServer(void)" (??0cLoginServer@@QAE@XZ) 1>cLoginServer.obj : error LNK2019: unresolved external symbol "public: __thiscall cServer::cServer(void)" (??0?$cServer@GG@@QAE@XZ) referenced in function "public: __thiscall cLoginServer::cLoginServer(void)" (??0cLoginServer@@QAE@XZ) 1>cLoginServer.obj : error LNK2019: unresolved external symbol "public: void __thiscall cServer::grow_to(unsigned int)" (?grow_to@?$cServer@GVcUser4Login@@@@QAEXI@Z) referenced in function "public: void __thiscall cLoginServer::LoadConfigFile(void)" (?LoadConfigFile@cLoginServer@@QAEXXZ) 1>cLoginServer.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall cServer::capacity(void)" (?capacity@?$cServer@GVcUser4Login@@@@QAEIXZ) referenced in function "public: void __thiscall cLoginServer::SaveConfigFile(void)" (?SaveConfigFile@cLoginServer@@QAEXXZ) 1>cLoginServer.obj : error LNK2019: unresolved external symbol "public: unsigned int __thiscall cServer::capacity(void)" (?capacity@?$cServer@GG@@QAEIXZ) referenced in function "public: void __thiscall cLoginServer::ShutDown(unsigned char)" (?ShutDown@cLoginServer@@QAEXE@Z) 1>cLoginServer.obj : error LNK2019: unresolved external symbol "public: void __thiscall cServer::remove(unsigned short)" (?remove@?$cServer@GVcUser4Login@@@@QAEXG@Z) referenced in function "public: void __thiscall cLoginServer::LogOut(unsigned short)" (?LogOut@cLoginServer@@QAEXG@Z) 1>cLoginServer.obj : error LNK2019: unresolved external symbol "public: void __thiscall cServer::remove(unsigned short)" (?remove@?$cServer@GG@@QAE