Hello Matthew, You need to use #pragma link C++ nestedclass; #pragma link C++ nestedtypedef; together with what you have tried. There is a historical reason that cint does not activated nested classes by default. Thank you Masaharu Goto > >How do I export a function, which is nested in a namespace, from a >shared library so that it is available from the CINT interpreter? > >Here is a concrete example of the function that I am trying to export >from a shared library to CINT. The function, named "cross_section" (see >below), is nested inside of multiple namespaces. Here is the contents >of the header file which declares "cross_section": > > // cross_section.hxx > namespace MDL > { > namespace WAB > { > double cross_section( double* variables, double* parameters ); > } > } > > >Finally, here is the relevant part of the LinkDef.h file that I am >trying to use to export "cross_section" from the shared library to the >CINT interpreter: > > > // LinkDef.h > #pragma link C++ function MDL::WAB::cross_section; > > >This doesn't work, as evidenced by the following error message when I >try to run rootcint on these two files: > > > $ rootcint -f cross_sectionDict.cxx -c cross_section.hxx LinkDef.h > Note: link requested for unknown function MDL::WAB::cross_section >FILE:LinkDef.h LINE:21 > > >The pragma that I used (above) was the most straightforward method I >could think of to export the function "cross_section". Since it didn't >work, I also tried various combinations of the pragmas documented in the >CINT Reference Manual (see http://root.cern.ch/root/Cint.phtml?ref and >search for "#pragma"). In particular, I tried various combinations of >the following two pragmas that seemed to have something to do with >namespaces: > > > #pragma link [C|C++|off] [class|struct|union|enum|namespace] [name]; > #pragma link [C|C++|off] defined_in [class/struct/namespace name]; > > >However, I could find no documentation on how to use these two specific >pragmas. Would someone knowledgeable please instruct us in the use of >these two pragmas? Would the use of some combination of these two >pragmas solve my problem with exporting the "cross_section" function >from a shared library to the CINT interpreter? > >I have attached both of the files "cross_section.hxx" and "LinkDef.h" in >their entirety to this e-mail so that others could try and run the >command > > $ rootcint -f cross_sectionDict.cxx -c cross_section.hxx LinkDef.h > >on them. Please let us know if you can find the correct combination of >the CINT pragmas that allow rootcint to run properly on these two files. >Thank you. > > >-- >Matthew D. Langston >SLD, Stanford Linear Accelerator Center >langston@SLAC.Stanford.EDU
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