C/C++ のコードを python で利用する。
個人的には、boost よりも使いやすい。

exPybind11.cpp

#include <iostream>
#include <cstdio>
#include <cstdlib>
 
#include <pybind11/pybind11.h>
 
void functionInPython(void){
  std::cout << "call functionInCPP\n";
}
 
class ClassInCpp {
 
public:
 
  ClassInCpp(void) : varInClassInCpp("varInClassInCpp"){ }
 
  std::string varInClassInCpp ;
 
  void functionClassInCpp(void){
    std::cout << "call functionClassInCpp\n";
  }
 
  template <typename TT1>
  TT1 templateFunctionInCpp(TT1 x){
    std::cout << "call templateFunctionInCpp -arg= " << x << "\n";
 
    return x * x;
 
  }
 
};
 
PYBIND11_MODULE(examplePybind11, m) {
 
  m.def("functionInPython", &functionInPython);
 
  pybind11::class_<ClassInCpp>(m, "classInPython")
    .def(pybind11::init<>())
    .def_readwrite("varInPython", &ClassInCpp::varInClassInCpp)
    .def("functionClassInPython", &ClassInCpp::functionClassInCpp)
 
    // template function
    .def("templateFunctionInPython",
         (uint64_t (ClassInCpp::*)(uint64_t)) &ClassInCpp::templateFunctionInCpp)
    .def("templateFunctionInPython",
         (float (ClassInCpp::*)(float )) &ClassInCpp::templateFunctionInCpp);
}

c++ exPybind11.cpp -o examplePybind11.so -std=c++11 -shared -fPIC \
-I"pybindIncludeDir" \
`/usr/bin/python3-config --cflags --ldflags`

ここで、examplePybind11.so の prefix (“.so” を除外した部分) は、
“PYBIND11_MODULE(examplePybind11, m)” の第一引数と同じこと。

example.py

import os
import sys
 
import examplePybind11
 
examplePybind11.functionInPython()
 
c = examplePybind11.classInPython()
 
print(c.varInPython)
 
c.functionClassInPython()
 
v = c.templateFunctionInPython(2)
print (v)
 
v = c.templateFunctionInPython(1.1)
print (v)

list.cpp

void func(pybind11:list pylist){
  for (uint64_t i=0; i<pylist.size(); i++){
    pybind11::handle item = pylist[i];
    std::string x = item.cast<std::string>();
  }
}