# std::basic_streambuf<CharT,Traits>::basic_streambuf

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< cpp‎ | io‎ | basic streambuf

protected: basic_streambuf(); | (1) |
protected: basic_streambuf(const basic_streambuf& rhs); | (2) | (since C++11)

1) Constructs the `basic_streambuf` object, initializes the six pointer members (`eback()`, `gptr()`, `egptr()`, `pbase()`, `pptr()`, and `epptr()`) to null pointer values, and the locale member to std::locale (), a copy of the global C++ locale at the time of construction.
2) Constructs a copy of `rhs`, initializing the six pointers and the locale object with the copies of the values held by `rhs`. Note that this is a shallow copy: the pointers of the newly-constructed basic_streambuf are pointing into the same character array as the pointers of `rhs`.

Both constructors are protected, and are only called by the concrete streambuf classes, such as std::basic_filebuf, std::basic_stringbuf, or std::strstreambuf.

### Parameters

rhs | - | a streambuf object to copy

### Notes

Until C++11, it was unspecified whether `basic_streambuf` or any of its derived classes is CopyConstructible (LWG issue 421), and different C++ library implementations provided different options.

### Example

| This section is incomplete Reason: no example

### See also

(constructor) | constructs a basic_filebuf object (public member function of `std::basic_filebuf<CharT,Traits>`)
(constructor) | constructs a basic_stringbuf object (public member function of `std::basic_stringbuf<CharT,Traits,Allocator>`)
(constructor) | constructs a strstreambuf object (public member function of `std::strstreambuf`)

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