C++ keep getting error LNK2019: unresolved external symbol [duplicate]

Answer 1

You need to put all the template implementations that you have in your .cpp file in the header file, or in a file included by the header. And don't try to compile the implementation file. Some systems attempt to compile files with a .cpp suffix. The compiler needs to see the code in order to instantiate templates.

Answer 2

The most simplest solution to the problem is:

Wherever you want to include your template class e.g. "DynIntStack.h" instead do "DynIntStack.cpp". e.g. in your main.cpp above.

Simple as that, no need to change anything else.

Answer 3

at the bottom of DynIntStack.h, put

#include <DynIntStack.cpp>

what's happening is the compiler doesn't see the template implementation code so cannot emit anything for it.