我正在使用cython封装一个C++库。在头文件中,有一些结构体继承自其他结构体,例如:
struct A {
int a;
};
struct B : A {
int b;
};
这段内容应该如何在我的
cdef extern...
块中呈现?在Cython中使用C++并没有提到任何特殊的内容:
#file: pya.pyx
cdef extern from "a.h":
cdef cppclass A:
int a
cdef cppclass B(A):
int b
包装类:
#file: pya.pyx
cdef class PyB:
cdef B* thisptr
def __cinit__(self):
self.thisptr = new B();
def __dealloc__(self):
del self.thisptr
property a:
def __get__(self): return self.thisptr.a
def __set__(self, int a): self.thisptr.a = a
property b:
def __get__(self): return self.thisptr.b
def __set__(self, int b): self.thisptr.b = b
例子:
import pyximport; pyximport.install(); # pip install cython
from pya import PyB
o = PyB()
assert o.a == 0 and o.b == 0
o.a = 1; o.b = 2
assert o.a == 1 and o.b == 2
#file: pya.pyxbld
import os
from distutils.extension import Extension
dirname = os.path.dirname(__file__)
def make_ext(modname, pyxfilename):
return Extension(name=modname,
sources=[pyxfilename, "a.cpp"],
language="c++",
include_dirs=[dirname])