[Swig-user] swig std::vector help

[Goutham <gou...@gm...>]

Hey All,

I am trying to implement a python wrapper for my code written in C++. I am
having trouble with the std::vector data types, as they get converted to
tuple. I was wondering if you can help me out a bit.

I have two c++ functions:

std::vector<int> selectResidues(std::vector<int> selection)
void fixAtoms(std::vector<int> selection)

To access std::vector<int> in the python interface, I use in the *.i swig
wrapper file:

%include "std_vector.i"
// for handling type conversions
%include "typemaps.i"
// map IndexList
namespace std {
   %template(IndexList) vector< int> ;
}
typedef std::vector<int> IndexList;


Here is a sample python code checking this function :
res1 = simkit.IndexList()
res1.push_back(2); res1.push_back(3); res1.push_back(4); res1.push_back(5);
sel1 =  sel.selectResidues(res1)
sel2 =  simkit.IndexList(sel.selectResidues(res1))

md.fixAtoms(sel2)  # works fine; md is the object from SimSystem class in
simkit
md.fixAtoms(sel1)  # gives error

The error i get from this is:
def fixAtoms(*args): return _SimKit.SimSystem_fixAtoms(*args)
TypeError: in method 'SimSystem_fixAtoms', argument 2 of type 'IndexList &'


Basically when I do type(sel1) and type(sel2), I get,
sel2 =  <class 'SimKit.IndexList'>
sel1 =  <type 'tuple'>

I am trying to figure out how to make selectResidues() function return of
data type SimKit.IndexList instead of casting to the type tuple.
Alternately, even if I can figure out fixAtoms() to accept tuple/list apart
from IndexList as arguement, that will work. Any suggestions on how I can do
this?

Thanks
Goutham