Template class - unresolved external symbol(s) [duplicate]

Question

I get this error a LOT, and i never know why. Can someone help me find the cause of it?

Edit:Removed code

Answer 1

Put the implementation (your method definitions) into the header along with the class declaration (see this in the C++ FAQ). Some compilers have supported an "export" keyword for doing it the way that you did, but that has been nixed in the C++0x.

Answer 2

Templates must be defined in header files. See these FAQs for more info:

• Why can't I separate the definition of my templates class from its declaration and put it inside a .cpp file?
• How can I avoid linker errors with my template functions?