Hi Brandon,
See the Release Notes about this question at:
http://root.cern.ch/root/htmldoc/examples/Version302.news.html
Look at section "Template Support"
Rene Brun
On Fri, 18 Jan 2002, Brandon Kohn wrote:
> HI Rene,
>
> I'm trying to do some template stuff with root (basically just want the
> autodocs to document my template class), but I'm having trouble finding a
> definitive how-to or faq on using templates with root. The part that I'm
> fuzzy on is how or where to place template instantiations to correspond with
> the ones in the linkdef:
>
> I.e.
>
> #ifdef __CINT__
>
> #pragma link off all globals;
> #pragma link off all classes;
> #pragma link off all functions;
>
> #pragma link C++ class LD_Template_Array<int>-;
> #pragma link C++ class LD_Template_Vector<int>-;
>
> #endif
>
> Now I have to instantiate LD_Template_Array<int> somewhere right?
>
> As it stands, here is the error I get when compiling the dictionary created
> with the above linkdef:
>
> NeutralDictionary.cpp(89) : error C2143: syntax error : missing ';' before
> '<'
> NeutralDictionary.cpp(89) : error C2373: '>>' : redefinition; different type
> modifiers
> NeutralDictionary.cpp(89) : error C2530: '>>' : references must be
> initialized
> NeutralDictionary.cpp(89) : error C2143: syntax error : missing ';' before
> '<'
> NeutralDictionary.cpp(90) : error C2143: syntax error : missing ';' before
> '{'
> NeutralDictionary.cpp(90) : error C2447: missing function header (old-style
> formal list?)
> NeutralDictionary.cpp(98) : error C2143: syntax error : missing ';' before
> '<'
> NeutralDictionary.cpp(98) : error C2373: '>>' : redefinition; different type
> modifiers
> NeutralDictionary.cpp(98) : error C2530: '>>' : references must be
> initialized
> NeutralDictionary.cpp(98) : error C2143: syntax error : missing ';' before
> '<'
> NeutralDictionary.cpp(99) : error C2143: syntax error : missing ';' before
> '{'
> NeutralDictionary.cpp(99) : error C2447: missing function header (old-style
> formal list?)
>
> And here is the code where the errors are occuring in the Dictionary file:
>
> template <> TBuffer &operator>><int >(TBuffer &buf, LD_Template_Array<int>
> *&obj)
> {
> // Read a pointer to an object of class LD_Template_Array<int>.
>
> ::Error("LD_Template_Array<int>::operator>>", "objects not inheriting
> from TObject need a specialized operator>> function"); if (obj) { }
> return buf;
> }
>
> //__________________________________________________________________________
> ____
> template <> TBuffer &operator>><int >(TBuffer &buf, LD_Template_Vector<int>
> *&obj)
> {
> // Read a pointer to an object of class LD_Template_Vector<int>.
>
> ::Error("LD_Template_Vector<int>::operator>>", "objects not inheriting
> from TObject need a specialized operator>> function"); if (obj) { }
> return buf;
> }
>
>
>
> Hope this is a good enough description, and thanks in advance for any help.
>
>
>
> Brandon
>
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