Struct WithContext 

pub struct WithContext<T, Ctx> {
    pub inner: T,
    pub ctx: Ctx,
}

Pairs a value with a context that supplies trait implementations.

By wrapping a value in WithContext, you can provide custom implementations of traits like Ord, Hash, or Display without modifying the original type.

Examples

use context_trait::{WithContext, OrdContext};
use std::cmp::Ordering;

let ctx = OrdContext { compare: |a: &i32, b: &i32| b.cmp(a) };
let a = WithContext { inner: 1, ctx };
let b = WithContext { inner: 2, ctx };
assert_eq!(a.cmp(&b), Ordering::Greater); // reversed!

Fields

inner: T

The wrapped value.

ctx: Ctx

The context providing trait implementations.

Trait Implementations

impl<T, Ctx> Clone for WithContext<T, Ctx>

where T: Clone, Ctx: Clone,

fn clone(&self) -> WithContext<T, Ctx>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T, Ctx> Debug for WithContext<T, Ctx>

where T: Debug, Ctx: Debug,

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

Formats the value using the given formatter.

impl<T> Display for WithContext<T, DisplayContext<T>>

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

Formats the value using the given formatter.

impl<T> Hash for WithContext<T, HashContext<T>>

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> Ord for WithContext<T, OrdContext<T>>

fn cmp(&self, other: &WithContext<T, OrdContext<T>>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T> PartialEq for WithContext<T, OrdContext<T>>

fn eq(&self, other: &WithContext<T, OrdContext<T>>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> PartialOrd for WithContext<T, OrdContext<T>>

fn partial_cmp(&self, other: &WithContext<T, OrdContext<T>>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T, Ctx> Copy for WithContext<T, Ctx>

where T: Copy, Ctx: Copy,

impl<T> Eq for WithContext<T, OrdContext<T>>