std::ios_base::ios_base(3) C++ Standard Libary std::ios_base::ios_base(3) NAME std::ios_base::ios_base - std::ios_base::ios_base Synopsis private: (until C++11) ios_base( const ios_base& ); public: (1) (since C++11) ios_base( const ios_base& ) = delete; protected: (2) ios_base(); 1) The copy constructor is private (until C++11) deleted (since C++11): streams are not copyable. 2) The default constructor is protected: only derived classes may con- struct std::ios_base. The internal state is undefined after the construction. The derived class must call std::basic_ios::init() to complete initialization before first use or before destructor; otherwise the behavior is undefined. Notes The same applies to the constructors of the next class in the I/O hier- archy, std::basic_ios. Further-derived classes (std::istream and std::ostream) are always constructed with a concrete stream buffer object and call std::ba- sic_ios::init(), possibly more than once, to complete initialization of their virtual base. Defect reports The following behavior-changing defect reports were applied retroac- tively 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 the behavior of destroying a LWG 220 C++98 std::ios_base the behav- ior is object before calling its init() was not undefined in this case clear LWG 1249 C++98 initialization did not need to be also needs to be completed before first use completed http://cppreference.com 2024.06.10 std::ios_base::ios_base(3)
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