SwigによるPython拡張モジュール

配列処理の例。

// hoge.h
class MyError {};

class MyArray
{
  int num;
  int* vals;
public:
  MyArray(int num);
  int __getitem__(int idx) throw(MyError);
};

// hoge.cpp
#include "hoge.h"

MyArray::MyArray(int num)
{
  this->vals = new int[num];
  this->num = num;
  for (int i=0; i < num; i++) this->vals[i] = i;
}

int
MyArray::__getitem__(int idx) throw(MyError)
{
  if (idx < 0 || this->num <= idx) throw MyError();
  return this->vals[idx];
}

// hoge.i
%module hoge
%{
#include "hoge.h"
%}

%include "hoge.h"

C:\temp\python>swig -c++ -python hoge.i

C:\temp\python>g++ -c hoge.cpp -c hoge_wrap.cxx -IC:\Python25\include

C:\temp\python>g++ -shared -o _hoge.pyd hoge.o hoge_wrap.o C:\Python25\libs\python25.lib C:\Python25\libs\libpython25.a

>>> import hoge
>>> a = hoge.MyArray(100)
>>> a[99]
99
>>> a[100]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "hoge.py", line 94, in __getitem__
    def __getitem__(self, *args): return _hoge.MyArray___getitem__(self, *args)
hoge.MyError