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export template class in MFC extension DLL

Posted on 1998-02-08
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Last Modified: 2013-11-19
I know I can't export a template class in MFC extension DLL bu doing

template<class T>
class AFX_EXT_CLASS CSharedMemT: public CObject
{
...

I was told to "explicitly instantiate the template-based classes I really want to export, and export those on a case-by-case basis"

My Q is, how do I do that in the MFC extension DLL? I need shor, simple deom code on how this can be implemented.

Thanks

Joshua
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Question by:joshual
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3 Comments
 
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Expert Comment

by:galkin
ID: 1315820
You cannot export template clas. Instaed you must define all functions of the template class as inline(wighout __declspec(_dllexport)) and simply include header whre you want to use it. Template class is actually created by compiler based on parameter passed.
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Author Comment

by:joshual
ID: 1315821
What is the point of exporting the function when you can't export the class? As I have said in my Q, maybe can you show me a short smaple program.

Thanks.

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Accepted Solution

by:
galkin earned 200 total points
ID: 1315822
Look at any of MFC template collection classes CList, CArray, CMap. You will find that all their functions are implemented as inline. Inline function are not exported from a DLL so these classes are not exported from MFC42.DLL. Instead each time you use either of them compiler creates new class based on template parameter(s) and code is added to your DLL or EXE which uses this template classes. So you must do the same. You must distribute template class header with inline functions
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