Passing a Python array to a C++ vector using Swig

Question

I have an array of objects in Python

[obj1, obj2, obj3]

and I want to pass them to off to a C++ function to perform some computation. I'm using SWIG to write my interface. The class type of the passed object is already defined in C++.

What's the best way to do this?

"best way" given what constraints? Are external libraries allowed, or do you want to go through Python's special purpose facilities? — Max Lybbert
– Max Lybbert, Commented Dec 15, 2008 at 20:06

Community · Accepted Answer · 2017-05-23 12:30:42Z

2

It depends on if your function is already written and cannot be changed, in which case you may need to check Swig docs to see if there is already a typemap from PyList to std::vector (I think there is). If not, taking PyObject* as the argument to the function and using the Python C API for manipulating lists should work fine. I haven't had any problems with it so far. For self-documentation, I recommend typedef'ing PyObject* to some kind of expected type, like "PythonList" so that the parameters have some meaning.

This may also be useful:

How to expose std::vector<int> as a Python list using SWIG?

edited May 23, 2017 at 12:30

CommunityBot

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answered Dec 15, 2008 at 22:17

Michel

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