private: ios_base( const ios_base& );
public: ios_base( const ios_base& ) = delete;
std::ios_base. The internal state is undefined after the construction. The derived class must call
basic_ios::init()to complete initialization before first use or before destructor; otherwise the behavior is undefined.
The same applies to the constructors of the next class in the I/O hierarchy,
std::basic_ios. Further-derived classes (
std::ostream) are always constructed with a concrete streambuffer object and call
basic_ios::init(), possibly more than once, to complete initialization of their virtual base.
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 constructor was not specified||specified as private|
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