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我基本上有一個非常簡單的節點測試用例,我試圖修復。如何在C++中分配一個在python中創建的對象?
我有一個getChild和的getParent簡單Node類
子可以通過的addChild函數
然後該功能自動設置父上的相關類(因此從c被分配++側)
不幸的是,當我這樣做,我失去了蟒蛇參考..
我猜代碼應該是更好的理解:
的基本主類MYNODE:
class MyNode
{
public:
MyNode(): m_name("unknown") {}
MyNode(std::string name): m_name(name) {}
MyNode(MyNode * const o) : m_name(o->m_name) {}
virtual ~MyNode() {}
std::string getName() const { return m_name; }
void setName(std::string name) { m_name = name; }
boost::shared_ptr<MyNode> getChild() const { return m_child; }
const boost::shared_ptr<MyNode> & getParent() const { return m_parent; }
void addChild(boost::shared_ptr<MyNode> node) {
m_child = node;
node->m_parent = boost::make_shared<MyNode>(this);
}
private:
std::string m_name;
boost::shared_ptr<MyNode> m_parent;
boost::shared_ptr<MyNode> m_child;
};
然後提升python綁定代碼:
class_< MyNode, boost::shared_ptr<MyNode>/*, MyNodeWrapper*/ >("MyNode", init<std::string>())
.add_property("Name", &MyNode::getName, &MyNode::setName)
.add_property("Child", &MyNode::getChild)
.add_property("Parent", make_function(&MyNode::getParent, return_internal_reference<>()))
.def("addChild", &MyNode::addChild)
;
要完成我的Python測試代碼:
>>> p=MyNode("p")
>>> o=MyNode("o")
>>> p.addChild(o)
>>> o.Parent
<hello_ext.MyNode object at 0x01C055A8> << this is not equal to p
>>> p
<hello_ext.MyNode object at 0x01C06510> << as you can see p here
>>> o.Parent
<hello_ext.MyNode object at 0x01C055A8> << but at least the pointer doesn't change each time the Parent is called !
>>> p.Child == o << so for the child it works
True
>>> o.Parent == p << but it doeesn't work for Parent
False
這個問題肯定在addFunction中,我如何使用boost :: make_shared來設置父級。 我遺憾的是不知道發生了什麼事.. 我試着使用升壓包裝:
struct MyNodeWrapper : public MyNode, public boost::python::wrapper<MyNode>
{
MyNodeWrapper(PyObject * a_PyObj) : m_Self(a_PyObj) {}
MyNodeWrapper(PyObject * a_PyObj, const MyNode & a_Vec) : MyNode(a_Vec), m_Self(a_PyObj) {}
MyNodeWrapper(PyObject * a_PyObj, std::string name) : MyNode(name) , m_Self(a_PyObj) {}
PyObject * m_Self;
};
但我仍然不知道我應該怎麼修改的addChild功能
任何想法?
非常感謝! 我發現了另一個解決方案,其中我被利用外部函數..是這樣的: '空隙的addChild(升壓:: shared_ptr的 pythis,升壓:: shared_ptr的節點) { \t pythis-> m_child =節點; \t node-> m_parent = pythis; \t }' –
user2111835
2013-02-28 15:32:29
但你的解決方案更好..所以如果別人有同樣的問題,你所要做的就是繼承自enable_shared_from_this然後addFunction可以像這樣分配父指針:node-> m_parent = shared_from_this() ; 太容易了,再次感謝! – user2111835 2013-02-28 15:36:10