protected: basic_istream& operator=( const basic_istream& rhs ) = delete; | (1) | |
protected: basic_istream& operator=( basic_istream&& rhs ); | (2) | (since C++11) |
1) The copy assignment operator is protected, and is deleted. Input streams are not CopyAssignable.
2) The move assignment operator exchanges the gcount() values and all data members of the base class, except for rdbuf()
, with rhs
, as if by calling swap(*rhs)
. This move assignment operator is protected: it is only called by the move assignment operators of the derived movable input stream classes std::basic_ifstream
and std::basic_istringstream
, which know how to correctly move-assign the associated streambuffers.
rhs | - | the basic_istream object from which to assign to *this |
#include <sstream> #include <iostream> int main() { std::istringstream s1; s1 = std::istringstream("test"); // OK std::cin = std::istringstream("test"); // ERROR: 'operator=' is protected }
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/io/basic_istream/operator=