std::basic_ios CharT,Traits ::rdbuf - Serbipunk/notes GitHub Wiki

https://en.cppreference.com/w/cpp/io/basic_ios/rdbuf

1. std::basic_streambuf<CharT, Traits>* rdbuf() const;

2. std::basic_streambuf<CharT, Traits>* rdbuf( std::basic_streambuf<CharT, Traits>* sb );

管理输出关联的stream buff

1. 返回关联的buf指针，如果为空，返回 nullptr

2. 将关联的stream buffer设置为给定的streambuf指针