Struct DebugList

pub struct DebugList<'f, 'w> { /* private fields */ }

For debug formatting a list/array.

Example

This example demonstrates how you can debug format a custom type as a list.

use const_format::{Error, Formatter};
use const_format::{formatc, impl_fmt, try_};

use std::ops::Range;

fn main() {
    const LIST: &str = formatc!("{:?}", RangeList(0..5));
     
    assert_eq!(LIST, "[0, 1, 2, 3, 4]");
}

struct RangeList(Range<usize>);

impl_fmt!{
    impl RangeList;
     
    const fn const_debug_fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
        let mut f = f.debug_list();
        let mut i = self.0.start;
        while i < self.0.end {
            try_!(f.entry().write_usize_display(i));
            i+=1;
        }
        f.finish()
    }
}

Implementations

impl<'f, 'w> DebugList<'f, 'w>

pub const fn entry(&mut self) -> &mut Formatter<'w>

Adds a list entry to the formatted output

pub const fn finish(self) -> Result<(), Error>

Finishes writing the list, and if anything went wrong in the entry method,returns an error.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes