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dll-exporting a class defined with a template

gil_mo
gil_mo asked
on
Medium Priority
259 Views
Last Modified: 2010-04-02
Hi,
The following code attempts to dll-export the class cBig; the MicroSoft Visual C++ 5.0 compiler generates the following warning:

warning C4251: 'mRange' : class 'TRange<long>' needs to have dll-interface to be used by clients of class 'CBig'

the code :
// Start of code
#define DllExport __declspec( dllexport )

template<class T> class TRange
{
.
.
}

class DllExport cBig
{
public:
.
.
protected:
    typedef TRange<long> CRange;
    CRange mRange;
}
// End of code

What should I do in order to resolve this warning? I've tried to insert an additional 'DllExport' almost everywhere in the code.
Comment
Watch Question

Commented:
I declared the template class as DllExport and added ";" to the ends of the classes like

template<class T> class DllExport TRange
   {
   } ;

   class DllExport cBig
   {
   public:
   protected:
       typedef TRange<long> CRange;
       CRange mRange;
   } ;

and it worked fine.

Author

Commented:
nietod,
warning persists if the class template isn't empty, e.g.

template<class T> class DllExport TRange
{
private:
    long a;
};

Commented:
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