Function write_table_with_fmt 

pub fn write_table_with_fmt<Row, const COLUMN_COUNT: usize>(
    to: impl Write,
    iter: impl Iterator<Item = Row>,
    formatters: &[impl Fn(&Row, &mut String) -> Result; COLUMN_COUNT],
    column_names: &[&str; COLUMN_COUNT],
    column_widths: &[NonZeroUsize; COLUMN_COUNT],
) -> Result<()>

Render a table using custom formatters.

Variant of write_table that converts values to text using the provided formatters instead of the Display trait. Besides being able to use a different representation than the one provided by a type’s Display implementation, it is also useful for displaying values that do not implement Display.

Examples

use std::fmt::Write;

let addrs = [
    Ipv4Addr::new(192, 168, 0, 1),
    Ipv4Addr::new(1, 1, 1, 1),
    Ipv4Addr::new(255, 127, 63, 31),
];
let column_names = ["Full address", "BE bits", "Private"];
let column_widths = [17, 12, 7].map(|n| NonZeroUsize::new(n).expect("non zero"));

let formatters: [fn(&Ipv4Addr, &mut String) -> std::fmt::Result; 3] = [
    |addr, f| write!(f, "{}", addr),
    |addr, f| write!(f, "0x{:x}", addr.to_bits().to_be()),
    |addr, f| write!(f, "{}", if addr.is_private() { "yes" } else { "no" }),
];

write_table_with_fmt(stdout.lock(), addrs.iter().copied(), &formatters, &column_names, &column_widths)?;

╭─────────────────┬────────────┬───────╮
│ Full address    │ BE bits    │Private│
├─────────────────┼────────────┼───────┤
│ 192.168.0.1     │ 0x100a8c0  │ yes   │
│ 1.1.1.1         │ 0x1010101  │ no    │
│ 255.127.63.31   │ 0x1f3f7fff │ no    │
╰─────────────────┴────────────┴───────╯

Errors

If an I/O error is encountered while writing to the to writer, that error will be returned.