Trait Converter

Source

pub trait Converter<L, R> {
    type ToLeftError;
    type ToRightError;

    // Required methods
    fn convert_to_left(&self, right: &R) -> Result<L, Self::ToLeftError>;
    fn convert_to_right(&self, left: &L) -> Result<R, Self::ToRightError>;
}

Expand description

A trait for bidirectional conversion between two types.

This trait is used by Pair to convert between its left and right values.

§Example

use cached_pair::Converter;
use std::convert::Infallible;
use std::num::ParseIntError;

struct MyConverter;

impl Converter<i32, String> for MyConverter {
    type ToLeftError = ParseIntError;
    type ToRightError = Infallible;

    fn convert_to_left(&self, right: &String) -> Result<i32, Self::ToLeftError> {
        right.parse()
    }

    fn convert_to_right(&self, left: &i32) -> Result<String, Self::ToRightError> {
        Ok(left.to_string())
    }
}