std::ostreambuf_iterator is a single-pass LegacyOutputIterator 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 end of file condition has been reached.
Member types iterator_category, value_type, difference_type, pointer and reference are required to be obtained by inheriting from std::iterator<std::output_iterator_tag, void, void, void, void>.
#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>
int main()
{
std::string s = "This is an example\n";
std::copy(s.begin(), s.end(), std::ostreambuf_iterator<char>(std::cout));
}
Output:
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