Method GraphNodePtr

imperative/python/src/graph_rt.h:20–22

public:
    GraphNodePtr(T* node)
            : m_graph(node ? node->owner_graph()->shared_from_this() : nullptr),
              m_node(node) {}
    T* operator->() { return m_node; }
    T& operator*() { return *m_node; }
    operator bool() { return m_node; }