Boost.python Numpy example

Before recent advances such as Cython, Boost.Python was one of the best ways to integrate C++ code into Python programs. The following C++ source code exposes a C++ function to Python. The function takes a NumPy array as an argument and extracts a C++ integer type.

#include
#include "boost/python/extract.hpp"
#include "boost/python/numeric.hpp"
#include
using namespace boost::python;
// Functions to demonstrate extraction
void setArray(boost::python::numeric::array data) {
    // Access a built-in type (an array)
    boost::python::numeric::array a = data;
    // Need to  array elements because their type is unknown
    std::cout << "First array item: " << extract(a[0]) << std::endl;
}
// Expose classes and methods to Python
BOOST_PYTHON_MODULE(TestNumPy) {
    boost::python::numeric::array::set_module_and_type("numpy", "ndarray");
    def("setArray", &setArray);
}
```---

## Comments

### Comment #1 by ARAMBAM JAMES SINGH

[ARAMBAM JAMES SINGH](mailto:<jamesastrick@gmail.com>) - Aug 2, 2016

I get this error : import TestNumpy as tnp ImportError: dynamic module does not define init function (initTestNumpy)

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#### Comment #2 by James

[James](mailto:<jameastrick@gmail.com>) - Aug 0, 2016

Hi , I get the error "Segmentation fault: 11" when i run the python code after compiling above c++ code #--------------- # import TestNumPy as nt import numpy as np a = np.array(\[10,20,30\]) nt.setArray(a)

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