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std::ios_base::operator=

private:
ios_base& operator=( const ios_base& );
(until C++11)
public:
ios_base& operator=( const ios_base& ) = delete;
(since C++11)

The copy assignment operator is private (until C++11)deleted (since C++11): streams are not copy-assignable.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 50 C++98 the copy assignment operator was not specified specified as private

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