Lcpp

HWcpp

In this lecture we will write simple C++ extensions for Python. We will be using pybind11 to do that.

Here is an example C++ code, which can be converted as an extension:

#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include <vector>
#include <string>

using std::vector;
using std::string;


// Here is your class code
struct MyClass {
    MyClass() {}
    int f(vector<string> arr) {
        int ss = 0;
        for (auto &s: arr) {
            ss += s.size();
        }
        return ss;
    }
};


// This is the binding code, every function you want to export, must be declared here
PYBIND11_MODULE(example, m) {
    m.doc() = "pybind11 example plugin"; // optional module docstring

    pybind11::class_<MyClass>(m, "MyClass")
        .def(pybind11::init())
        .def("f", &MyClass::f);
}