Why the constructor of std::ostream is protected?

Why the constructor of std::ostream is protected?



1.c++ - Why the constructor of std::ostream is protected ...

Description:std::ostream is conceptually abstract - you're not supposed to
create them (but see other answers for more detail on that).
std::stringstream gives you everything std ...



2.ostream::ostream - C++ Reference - cplusplus.com - The C++ ...

Description:protected: ostream& (ostream&& x); ... // ostream constructor
#include <iostream> // std::cout, std::ostream, std:: ...



3.ostream - C++ Reference - cplusplus.com - The C++ ...

Description:std:: ostream. typedef basic ... (constructor) Construct
object (public member function ) ... operator<< (ostream) protected
members: ostream::operator= ostream::swap;



4.c++ - Why can't std::ostream be moved? - Stack Overflow

Description:std::ostream (well, the class template std::basic_ostream
really) has a protected move constructor according to 27.7.3.1 [ostream].
Why can't std:: ...



5.Boost: Base-from-Member Idiom Documentation

Description:... ( int fd ); //... }; class fdostream : public std::ostream
{ protected: fdoutbuf buf; public: ... constructor member templates, ...



6.ostream - C++ Reference

Description:// ostream constructor #include <iostream> #include <fstream>
using namespace std; ... [protected] (protected member function)



7.ostream::ostream - C++ Reference - whitefirer

Description:// ostream constructor #include <iostream> #include <fstream>
using namespace std; ... [protected] (protected member ...



8.ostream constructor error - PC Review

Description:>> and added this line "using namespace std;" > Ok, but do you
understand why these ... protected: ostream ... ostream passed to the
constructor needs to ...



9.<iostream> vs <iostream.h>

Description:... explaining what the difference is and why, ... classes had
protected default constructors. ... constructor available to std::ostream
is one ...



10.Quick question: Array/Vector of std::ostream ?

Description:How do you create an array of std:: ostream objects? It has no
default constructor so it doesn't seem to be ... But, ... but... why can't
I initialize array elements ...