我有以下 C++ 类接口(interface),我正在尝试对其进行 cythonize。
class NetInfo
{
public:
NetInfo();
NetInfo(NetInfo const& rhs);
virtual ~NetInfo();
void swap(NetInfo& rhs) throw();
NetInfo& operator=(NetInfo rhs);
...
}
这就是我到目前为止所拥有的。我不完全确定如何实现复制构造函数。我在 Cython 用户指南中没有看到任何示例。复制构造中的问题是如何从“其他”(即 PyNetInfo 对象)获取 NetInfo 对象。有什么想法吗?
cdef extern from 'NetInfo.h' namespace '...':
cdef cppclass NetInfo:
NetInfo() except +
NetInfo(NetInfo&) except +
operator=(NetInfo) except +
...
cdef class PyNetInfo:
cdef NetInfo* thisptr
def __cinit__(self, PyNetInfo other=None):
cdef PyNetInfo ostr
if other and type(other) is PyNetInfo:
ostr = <PyNetInfo> other
self.thisptr = ostr.thisptr
else:
self.thisptr = new NetInfo()
def __dealloc__(self):
del self.thisptr
最佳答案
Cython 有特殊的运算符来处理 C++ 的 *、&、++、-- 以与 Python 语法兼容。因此,需要导入和使用它们。请参阅http://cython.org/docs/0.24/src/userguide/wrapping_CPlusPlus.html#c-operators-not-compatible-with-python-syntax
from cython.operator cimport dereference as deref
cdef class PyNetInfo:
cdef NetInfo* thisptr
def __cinit__(self, other=None):
cdef PyNetInfo ostr
if other and type(other) is PyNetInfo:
ostr = <PyNetInfo> other
self.thisptr = new NetInfo(deref(ostr.thisptr))
else:
self.thisptr = new NetInfo()
def __dealloc__(self):
del self.thisptr
这是输出:
Type "help", "copyright", "credits" or "license" for more information.
>>> import netinfo
>>> a = netinfo.PyNetInfo()
>>> b = netinfo.PyNetInfo()
>>> a.setNetName('i am a')
>>> b.setNetName('i am b')
>>> c = netinfo.PyNetInfo(b) <-- copy construction.
>>> a.getNetName()
'i am a'
>>> b.getNetName()
'i am b'
>>> c.getNetName() <--- c == b
'i am b'
>>> c.setNetName('i am c') <-- c is updated
>>> a.getNetName()
'i am a'
>>> b.getNetName() <-- b is not changed
'i am b'
>>> c.getNetName() <-- c is changed
'i am c'
>>> exit()
关于python - Cython:复制构造函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37262974/