Re: Dll containing class with static member, Linker error

DllTest.h

#include <iostream>
using namespace std;
class __declspec(dllexport) CDllTest
{
public:
    CDllTest(){}
    ~CDllTest(){}

    void foo(){myint = new int();}

    static int* myint;
};

DllTest.cpp

int* CDllTest::myint = NULL;

This code is in a DLL called DllTest. When I try to link this dll to my
client app, I get a linker error. It is as follows:

Error 1 error LNK2001: unresolved external symbol "private: static int *
CDllTest::myint" (?myint@CDllTest@@0PAHA) DllTestApp.obj

I figured out if I put the intialization of myint into the header file along
with the class definition, it will link fine. It's only when I put the
intialization of myint in the cpp file. Yes I could just keep the
initialization in my cpp file, but that's not the point. The point is, why I
can't have it in my cpp file vs my header file. Thank's in advance for all
your help.