This implements the Read trait, calling a function to generate the data.

See the API documentation.

Import Crate

read_with="0.1"

Example

let mut output = vec!();
let many_strings = ["one", "two", "three"];
let mut pos = 0;

std::io::copy(
    &mut ReadWith::new(
        ||
        {
            if pos == many_strings.len() { return None; }
            let o = many_strings[pos];
            pos+=1;
            Some(o)
        }
    ),
    &mut output,
).unwrap();
assert_eq!("onetwothree", str::from_utf8(&output).unwrap());