See below...
Hi all. I must be doing something wrong but cannot figure it out. I
have a data class and a list class, in an extension DLL, declared like
this:
#define DllExport __declspec (dllexport)
class DllExport CRate : public CObject {
public:
DECLARE_SERIAL (CRate)
CRate () { m_Rate = 0; }
CRate (const CRate &in) { *this = in; }
const CRate& operator= (const CRate& in)
{ m_Rate = in.m_Rate; m_Date = in.m_Date; return *this; }
bool operator== (const CRate& in);
virtual void Serialize (CArchive& Ar);
double m_Rate;
CString m_Date;
};
class DllExport CRateList : public CList <CRate, CRate&> {
public:
DECLARE_SERIAL (CRateList)
double GetRate () const { return GetHead ().m_Rate; }
double GetRate (const CString &da) const;
void SetRate (const double& d, const CString &da);
const CRateList& operator= (const CRateList& in);
bool operator== (const CRateList& in);
bool operator!= (const CRateList& in)
{ return ! (*this == in); }
};
The implementation for serialization looks like this:
IMPLEMENT_SERIAL (CRate, CObject, 1)
IMPLEMENT_SERIAL (CRateList, CList, 1)
If I leave DllExport out of the class declarations, everything
compiles ok. It is still ok with DllExport only in the CRate class.
But when I put DllExport in the CRateList class, I get a compile error
like this:
"error C2678: binary '==' : no operator found which takes a left-hand
operand of type 'const CRate' (or there is no acceptable conversion)"
This error is attributed to the last line of a helper function called
CompareElements that looks like this (from afxtempl.h):
template<class TYPE, class ARG_TYPE>
BOOL AFXAPI CompareElements(const TYPE* pElement1, const ARG_TYPE* pElement2)
{
ENSURE(pElement1 != NULL && pElement2 != NULL);
ASSERT(AfxIsValidAddress(pElement1, sizeof(TYPE), FALSE));
ASSERT(AfxIsValidAddress(pElement2, sizeof(ARG_TYPE), FALSE));
return *pElement1 == *pElement2;
}
As far as I can find, that helper is only called from CList::Find
function, which I am not using... And anyway I cannot figure out why
this only happens when I use dllexport.
Help??
Thanks, Russ
Joseph M. Newcomer [MVP]