Re: "extern template class"
Igor R. wrote:
In MSVC 9.0 I try the following code:
//test1.h
template<class T> class Test1
{
public:
int func1();
};
extern template class Test1<int>;
//test1.cpp
#include "Test1.h"
template<class T>
int Test1<T>::func1()
{
return 1;
}
template class Test1<int>; //explicit instantiation
http://msdn.microsoft.com/en-us/library/by56e477.aspx
Both lines are explicit instantiations, and cannot coexist in the same
module. Just drop the line in the header with "extern" in it. The linker
will figure it all out.
"extern template" is only useful for importing template instantiations
from DLLs. See
http://support.microsoft.com/kb/168958
It talks about STL templates, but the same technique works for any other
template class.
--
With best wishes,
Igor Tandetnik
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