# std::ostreambuf_iterator

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< cpp‎ | iterator

Defined in header `<iterator>` |  |
template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void> |  | (until C++17)
template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator; |  | (since C++17)

`std::ostreambuf_iterator` is a single-pass `OutputIterator` that writes successive characters into the std::basic_streambuf object for which it was constructed. The actual write operation is performed when the iterator (whether dereferenced or not) is assigned to. Incrementing the `std::ostreambuf_iterator` is a no-op.

In a typical implementation, the only data members of `std::ostreambuf_iterator` are a pointer to the associated `std::basic_streambuf` and a boolean flag indicating if the the end of file condition has been reached.

### Member types

Member type | Definition
`char_type` | `CharT`
`traits_type` | `Traits`
`streambuf_type` | std::basic_streambuf<CharT, Traits>
`ostream_type` | std::basic_ostream<CharT, Traits>

### Member functions

(constructor) | constructs a new `ostreambuf_iterator` (public member function)
(destructor) (implicitly declared) | destructs an `ostreambuf_iterator` (public member function)
operator= | writes a character to the associated output sequence (public member function)
operator* | no-op (public member function)
operator++operator++(int) | no-op (public member function)
failed | tests if output failed (public member function)

### Member types

Member type | Definition
`value_type` | void
`difference_type` | void
`pointer` | void
`reference` | void
`iterator_category` | std::output_iterator_tag

Note: before C++17, these member types are required to be obtained by inheriting from std::iterator<std::output_iterator_tag,void,void,void,void>.

### Example

Run this code

    #include <string>
    #include <algorithm>
    #include <iterator>
    #include <iostream>

    int main()
    {
        std::string s = "This is an example\n";
        std::copy(s.begin(), s.end(), std::ostreambuf_iterator<char>(std::cout));
    }

Output:

    This is an example

### See also

istreambuf_iterator | input iterator that reads from std::basic_streambuf (class template)
ostream_iterator | output iterator that writes to std::basic_ostream (class template)

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