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use never::Never; use BufStream; use SizeHint; use futures::Poll; use std::io; use std::mem; impl BufStream for String { type Item = io::Cursor<Vec<u8>>; type Error = Never; fn poll_buf(&mut self) -> Poll<Option<Self::Item>, Self::Error> { if self.is_empty() { return Ok(None.into()); } let bytes = mem::replace(self, Default::default()).into_bytes(); let buf = io::Cursor::new(bytes); Ok(Some(buf).into()) } fn size_hint(&self) -> SizeHint { size_hint(&self[..]) } } impl BufStream for &'static str { type Item = io::Cursor<&'static [u8]>; type Error = Never; fn poll_buf(&mut self) -> Poll<Option<Self::Item>, Self::Error> { if self.is_empty() { return Ok(None.into()); } let bytes = mem::replace(self, Default::default()).as_bytes(); let buf = io::Cursor::new(bytes); Ok(Some(buf).into()) } fn size_hint(&self) -> SizeHint { size_hint(&self[..]) } } fn size_hint(s: &str) -> SizeHint { let mut hint = SizeHint::new(); hint.set_lower(s.len() as u64); hint.set_upper(s.len() as u64); hint }