Trait bczhc_lib::io::TryReadExact

pub trait TryReadExact {
    // Required method
    fn try_read_exact(&mut self, buf: &mut [u8]) -> Result<usize>;
}

Required Methods

fn try_read_exact(&mut self, buf: &mut [u8]) -> Result<usize>

Read exact data

This function blocks. It reads exact data, and returns bytes it reads. The return value will always be the buffer size until it reaches EOF.

When reaching EOF, the return value will be less than the size of the given buffer, or just zero.

Examples

use std::io::stdin;
use bczhc_lib::io::TryReadExact;

let mut stdin = stdin();
let mut buf = [0_u8; 5];
loop {
    let result = stdin.try_read_exact(&mut buf);
    match result {
        Ok(r) => {
            if r == 0 {
                // EOF
                break;
            }
            println!("Read: {:?}", &buf[..r]);
        }
        Err(e) => {
            eprintln!("IO error: {}", e);
        }
    }
}

Implementors

impl<R> TryReadExact for Rwhere R: Read,