std::basic_ostream::basic_ostream - cppreference.com

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# std::basic_ostream::basic_ostream

From cppreference.com
< cpp‎ | io‎ | basic ostream

explicit basic_ostream( std::basic_streambuf<CharT, Traits>* sb ); | (1) |
protected: basic_ostream( const basic_ostream& rhs ) = delete; | (2) | (since C++11)
protected: basic_ostream( basic_ostream&& rhs ); | (3) | (since C++11)

1) Constructs the `basic_ostream` object, assigning initial values to the base class by calling basic_ios::init(sb).

2) The copy constructor is protected, and is deleted. Output streams are not copyable.

3) The move constructor uses `basic_ios<CharT, Traits>::move(rhs)` to move all basic_ios members, except for the `rdbuf()`, from `rhs` into `*this`. 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.

### [edit] Parameters

sb | - | streambuffer to use as output sequence
rhs | - | basic_ostream to initialize from

### [edit] Example

Run this code

    #include <sstream>
    #include <utility>
    #include <iostream>

    int main()
    {
        // ERROR: copy ctor is deleted
    //  std::ostream myout(std::cout);

        // OK: shares buffer with cout
        std::ostream myout(std::cout.rdbuf());

        // ERROR: move constructor is protected
    //  std::ostream s2(std::move(std::ostringstream() << 7.1));

        // OK: move ctor called through the derived class
        std::ostringstream s2(std::move(std::ostringstream() << 7.1));
        myout << s2.str() << '\n';
    }

Output:

    7.1

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