I am using Dev-C++ and lambda expression (boost 1.34.1).

I created a dll containing a class. And want other programs to use the memberfunctions in the class.

the dll.h is:

...........................

#if BUILDING_DLL
# define DLLIMPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
# define DLLIMPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */
.............

class DLLIMPORT  classA{
 private:
  ...........  

   public:      
   int function1(const int& );

................

};

the dll.cpp is:

# include "dll.h"

........................

int classA::function1(const int& testnumber){

......................

}

.........................

In the classA::function1 in dll.cpp I used the lambda expression and the above dll is created OK.

and the main executable using the dll is:
# include "dll.h"

.................................

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

........................

  classA instanceA;
    instanceA.function1(3);

......................

the complier told me no errors but the linker told me that :

[Linker error] undefined reference to `classA::Function1(int const&)'

And I do not know how to solve it.

Does this error occur due to the use of lambda expression?

Can anyone with kindness help me?