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c++ - About std::ostream constructor - Stack Overflow The std::ostream, the std::istream or the std::iostream are base classes of stream types (e g std::stringstream, std::fstream, etc ) in the Standard Library These classes are protected against instantiation, you can instantiate their derived classes only
ostream - C++ Users Objects of class ostream are seldom constructed directly Generally some derived class is used (like the standard ofstream and ostringstream) The object pointed by sb may be accessed and or modified
std::basic_ostream lt;CharT,Traits gt;:: basic_ostream - Reference This move constructor is protected: it is called by the move constructors of movable output stream classes std::basic_ofstream and std::basic_ostringstream, which know how to correctly move the associated streambuffer
Why the constructor of std::ostream is protected? - Stack Overflow The default constructor of std::basic_ostream is protected because it generally doesn't make any sense to create an std::basic_ostream without setting its std::basic_streambuf and the default constructor actually doesn't do any initialization (see below)
std::basic_ostream - cppreference. com The class template basic_ostream provides support for high level output operations on character streams The supported operations include formatted output (e g integer values) and unformatted output (e g raw characters and character arrays)
ofstream - C++ Users Internally, its ostream base constructor is passed a pointer to a newly constructed filebuf object (the internal file stream buffer) Constructs an ofstream object, initially associated with the file identified by its first argument (filename), open with the mode specified by mode
ostream - Member Functions and Data by Group - IBM This constructor creates an ostream object that is attached to the streambuf object pointed to by the argument The format variables are initialized to their defaults
c++ - How to initialize ostream out in constructor, using char . . . If you have a reference to an std::ostream in the class, you want client code to pass you a reference to an existing ostream object in the constructor—an object which they guarantee will continue to exist as long as your object exists