CPython Extension

pybind11 - C++11 <-> Python

URL

https://github.com/pybind/pybind11

Doc

http://pybind11.readthedocs.org/

pybind11 是一個 header only 的專案, 可以幫助使用 C++ 來撰寫 CPython extension。

範例一 - 簡單函式

#include <pybind11/pybind11.h>

int add(int i, int j) {
    return i + j;
}

PYBIND11_MODULE(mymodule, m) {
    m.doc() = "pybind11 example plugin"; // optional module docstring
    // 函式參數和回傳值的型別會經過轉換
    // pybind11 支援許多內建的型別轉換
    m.def("add", &add, "A function which adds two numbers");
}

範例二 - keyword arguments

#include <pybind11/pybind11.h>

namespace py = pybind11;

int add(int i, int j) {
    return i + j;
}

PYBIND11_MODULE(mymodule, m) {
    m.doc() = "pybind11 example plugin"; // optional module docstring
    m.def("add", &add, "A function which adds two numbers",
          py::arg("i"), py::arg("j"));
}
#include <pybind11/pybind11.h>

namespace py = pybind11;
using namespace pybind11::literals;   // 使用 "_a" 後綴來宣告參數

int add(int i, int j) {
    return i + j;
}

PYBIND11_MODULE(mymodule, m) {
    m.doc() = "pybind11 example plugin"; // optional module docstring
    m.def("add", &add, "A function which adds two numbers",
          "i"_a, "j"_a);
}

範例三 - default arguments

#include <pybind11/pybind11.h>

namespace py = pybind11;

int add(int i, int j) {
    return i + j;
}

PYBIND11_MODULE(mymodule, m) {
    m.doc() = "pybind11 example plugin"; // optional module docstring
    m.def("add", &add, "A function which adds two numbers",
          py::arg("i") = 1, py::arg("j") = 3);
}

Exporting Variables

PYBIND11_MODULE(example, m) {
    m.attr("the_answer") = 42;
    py::object world = py::cast("World");
    m.attr("what") = world;
}