对码当歌,猿生几何?

std::basic_ofstream::operator=

From cppreference.com
< cpp‎ | io‎ | basic ofstream

basic_ofstream& operator=( basic_ofstream&& other );
(since C++11)

Move assigns the file stream other to *this, effectively move-assigning both the std::basic_ostream base class and the associated std::basic_filebuf.

other is left with no associated file. Note that the base class move assignment swaps all stream state variables (except for rdbuf) between *this and other.

Parameters

other - file stream to move.

Return value

*this

Example

See also

(C++11)
swaps two file streams
(public member function)
(C++11)
assigns a basic_filebuf object
(public member function of std::basic_filebuf)
(C++11)
move-assigns from another basic_ostream
(protected member function)