如何使SWIG扩展模块与Pickle一起使用? [英] How to make my SWIG extension module work with Pickle?

问题描述

我有一个使用SWIG作为包装器的Python扩展模块，我尝试用Pickle对其进行序列化，但失败=)

I have an extension module for Python that uses SWIG as a wrapper and I try to serialize it with Pickle and I fail =)

1. 如果任何人都有可以腌制的SWIG扩展程序源，很乐意看到它！
2. 似乎我应该实现 __reduce_ex__ 方法在我的C ++代码中.有人有__reduce_ex__的例子吗? 有类似的Stackoverflow问题，但省略了manager_constructor规范和实现.

1. If anyone has a source of SWIG extension that can be pickled, would love to see it!
2. It seems like I should implement __reduce_ex__ method in my C++ code. Does anyone have example of __reduce_ex__? There is similar Stackoverflow question but it omits manager_constructor specification and implementation.

推荐答案

似乎我找到了适用于我的简单解决方案:

Seems like I found simlple solution that works for me:

因此，假设我们有用SWIG生成的类C，然后将其包装

So let's say we have class C that was generated with SWIG, then we wrap it with

class PickalableC(C, PickalableSWIG):

    def __init__(self, *args):
        self.args = args
        C.__init__(self)

其中PickalableSWIG是

class PickalableSWIG:

    def __setstate__(self, state):
        self.__init__(*state['args'])

    def __getstate__(self):
        return {'args': self.args}

然后

pickle.loads(pickle.dumps(C()))

失败，但是

pickle.loads(pickle.dumps(PickalableC()))

成功=)

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