9 Iterators library [iterators]

9.8 Stream iterators [iterators.stream]

9.8.3 Class template istreambuf_iterator [istreambuf.iterator]

9.8.3.3 istreambuf_iterator::operator* [istreambuf.iterator::op*]

charT operator*() const

Returns: The character obtained via the streambuf member sbuf_->sgetc().