Hi Masaharu,
I was already using the nestedclass and nestedtypedef pragmas (they were
listed in my original e-mail). So, the problem/question remains - how
do I import a function in a namespace even though I am already using the
two pragmas that you recommend? If you look at my original e-mail, I
attached all of the files that are necessary to run the following
command:
$ rootcint -f cross_sectionDict.cxx -c cross_section.hxx LinkDef.h
Can you verify for me that you can actually run the above command
without problems? Thank you for your help and expertise.
Masaharu Goto wrote:
>
> 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
--
Matthew D. Langston
SLD, Stanford Linear Accelerator Center
langston@SLAC.Stanford.EDU
650.926.3279
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