LNK 2019 C++ Error

Question

I have a NewTree class that's been defined in NewTree.h. When I make a new instance of NewTree in my main method, it throws an LNK 2019 error.

NewTree.h:

template <class T>
class NewTree
{
public:

treeNode<T> *current;
treeNode<T> *root;

NewTree();
~NewTree();
bool insert(T *data, treeNode<T> *parent);
treeNode<T> search(T *target);
};

Line to make new instance of NewTree:

NewTree<xml_node<>> *tree = new NewTree<xml_node<>>();

Why is Visual Studio giving me an LNK error?

Full Error:

main.obj : error LNK2019: unresolved external symbol "public: __thiscall NewTree<class rapidxml::xml_node<char> >::NewTree<class rapidxml::xml_node<char> >(void)" (??0?$NewTree@V?$xml_node@D@rapidxml@@@@QAE@XZ) referenced in function _main

can you provide the full error? – Stephen Lin Mar 03 '13 at 22:05 — Stephen Lin, Mar 03 '13 at 22:05

score 1 · Accepted Answer · edited May 23 '17 at 11:43

1

Your template class has to be implemented in the header file. I think this is the reason of the problem. This is the only thing I can conclude from the code you have provided.

edited May 23 '17 at 11:43

Community

1
1

answered Mar 03 '13 at 22:06

nogard

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I think you're right, with the error he added; the constructor is undefined. – Stephen Lin Mar 03 '13 at 22:09

LNK 2019 C++ Error

1 Answers1