add interface for MotifCluster

[ntfrgl]

• check if ARPACK installed (so far only on Linux, OSX)
• compile motifcluster.cpp, include motifcluster.h in snap.i
• missing: typedef WeightVH

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To make this fully functional, two things are missing, and I would like to ask for your help:

1. Add WeightVH: see below
2. check for ARPACK on Windows: I don't have a Windows machine to test on.

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I tried adding WeightVH in the following way:

swig/snap.i

%template(WeightVH) TVec<TIntH>;
%ignore TVec< THash<TInt, TInt, TDefaultHashFunc<TInt> > >::GetPrimHashCd;
%ignore TVec< THash<TInt, TInt, TDefaultHashFunc<TInt> > >::GetSecHashCd;

swig/tvec.i

WeightVH.__getitem__ = getitem_vec
WeightVH.__setitem__ = setitem_vec
WeightVH.__iter__ = itervec
WeightVH.__len__ = len_vec
WeightVH.__delitem__ = delitem_vec

But both with and without the %ignores, this lead to the compilation error:

swig/snap_wrap.cxx

error: no member 'GetPrimHashCd' in 'THash<TInt, TInt, TDefaultHashFunc<TInt> >'
error: no member 'GetSecHashCd' in 'THash<TInt, TInt, TDefaultHashFunc<TInt> >'

Is it necessary to add functions to the C++ library?

[ntfrgl]

Works now!
The %ignore just needed the format from the %template declaration to fire.

swig/snap.i

%ignore TVec<TIntH>::GetPrimHashCd;
%ignore TVec<TIntH>::GetSecHashCd;