使用Boost序列化递归shared_ptr时失败问题求助

Hey folks, here's a sample code snippet that shows class B inheriting from class A, with A's constructor holding a shared_ptr pointing to an instance of B:

#include <fstream>
#include <iostream>
// #include <boost/archive/text_iarchive.hpp>
// #include <boost/archive/text_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/tmpdir.hpp>
#include <boost/filesystem.hpp>
#include <boost/serialization/shared_ptr.hpp>
// ... 后续代码可在此处补充

小提醒 #

这种设计要特别留意循环引用问题：如果B（或其成员）也持有A的shared_ptr，会导致两者的引用计数永远无法归0，进而引发内存泄漏。如果要用Boost序列化处理这类结构，需要显式处理循环引用，比如借助boost::serialization::object_id或者启用跟踪机制来让序列化库识别对象间的循环依赖。

内容的提问来源于stack exchange，提问作者B. A. Sylla