Feature gate: #![feature(buf_read_has_data_left)]

This is a tracking issue for adding has_data_left to BufRead. Its purpose is to determine whether a reader has any data left over to read.

Example

let file = File::open("foo.txt")?;
let reader = BufReader::new(file);
let is_not_empty = reader.has_data_left()?;

Steps / History

• Implementation: Add has_data_left() to BufRead #85815
• Final commenting period (FCP)
• Stabilization PR

Unresolved Questions

• Still need to finalize the name of has_data_left and whether the API should check the positive case or the negative case.
• Internals discussion (note that the post uses is_at_eof as the name of the new method).