Re: [Swig-devel] Import errors about template instantiation

[William S F. <ws...@fu...>]

Xin Shuai wrote:
> In libsequence, there're a few .tcc files which defines templates. I 
> think I can just handle them as usual templates. That is , First parse 
> the definition , then instantiate them using defined type.
> 
> Today I tried to use Alignment.tcc. So I revised my interface file:
> ...
> %include *<*../../Alignment.tcc*>*
> ...
> %template() Sequence::Alignment::IsAlignment*<*Sequence::Fasta*>*;
> ....
> 
> 
> Everything looks fine until I successfully created the wrapping code and 
> dynamic library. But when I want to import the dynamic library in 
> python, error appeared:
> ...
> ImportError: dlopen(../libsequence/biolib/_libsequence.so, 2): Symbol 
> not found: 
> __ZN8Sequence9Alignment7GetDataINS_5FastaEEERSiRSt6vectorIT_SaIS5_EES3_
> Referenced from: 
> /Users/diavy/Documents/BioLib/biolib/src/mappings/swig/python/libsequence/biolib/_libsequence.so
> Expected in: flat namespace
> 
> It seems like my instantiated template code haven't been complied into 
> my dynamic library.
> 
> Can anyone give me some advice?
Assuming the templates include the code bodies in the .tcc files, you 
need to add in a #include of the .tcc files into your wrappers. Take a 
look at any of the basic examples shipped with SWIG for details, where 
they normally #include the header files. Otherwise link to the compiled 
version of the template code.

William