Struct DisplayContext 

pub struct DisplayContext<T> {
    pub display: fn(&T, &mut Formatter<'_>) -> Result<(), Error>,
}

A context providing a custom display function.

When used with WithContext, implements Display by dispatching through the stored format function.

Examples

use context_trait::{WithContext, DisplayContext};

let ctx = DisplayContext {
    display: |v: &(i32, i32), f: &mut std::fmt::Formatter| {
        write!(f, "({}, {})", v.0, v.1)
    },
};
let w = WithContext { inner: (1, 2), ctx };
assert_eq!(format!("{w}"), "(1, 2)");

Fields

display: fn(&T, &mut Formatter<'_>) -> Result<(), Error>

The display function.

Trait Implementations

impl<T> Clone for DisplayContext<T>

fn clone(&self) -> DisplayContext<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Debug for DisplayContext<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Copy for DisplayContext<T>