对码当歌,猿生几何?

std::basic_iostream::operator=

From cppreference.com
< cpp‎ | io‎ | basic iostream
basic_iostream& operator=( const basic_iostream& other ) = delete;
(1)
protected:
basic_iostream& operator=( basic_iostream&& other );
(2) (since C++11)

Assigns another stream object.

1) Copy assignment is not allowed.
2) Move assigns another stream object. Effectively calls swap(rhs). This move assignment operator is protected: it is called by the move assignment operators of the derived stream classes std::basic_stringstream and std::basic_fstream which know how to properly move-assign the associated stream buffers.

Parameters

other - another stream to assign state of

Return value

*this

See also

constructs the object
(public member function)