Struct roa_core::Variable

pub struct Variable<'a> { /* fields omitted */ }

A wrapper of String.

Example

use roa_core::Variable;
use http::StatusCode;
assert_eq!(1, Variable::new("id", "1".to_string()).parse().unwrap());
let result = Variable::new("id", "x".to_string()).parse::<usize>();
assert!(result.is_err());
let status = result.unwrap_err();
assert_eq!(StatusCode::BAD_REQUEST, status.status_code);
assert!(status.message.ends_with("type of variable `id` should be usize"));

Methods

impl<'a> Variable<'a>

pub fn new(name: &'a str, value: String) -> Self

Construct a variable from name and value.

pub fn parse<T>(&self) -> Result<T, Error> where
    T: FromStr,
    T::Err: Display, 

A wrapper of str::parse. Converts T::FromStr::Err to Status automatically.

Example

use roa_core::Variable;
use http::StatusCode;
let result = Variable::new("id", "x".to_string()).parse::<usize>();
assert!(result.is_err());
let status = result.unwrap_err();
assert_eq!(StatusCode::BAD_REQUEST, status.status_code);
assert!(status.message.ends_with("type of variable `id` should be usize"));

pub fn into_value(self) -> String

Into inner value.

Trait Implementations

impl<'_> AsRef<str> for Variable<'_>

fn as_ref(&self) -> &str

Performs the conversion.

impl<'a> Clone for Variable<'a>

fn clone(&self) -> Variable<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Variable<'a>

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<'_> Deref for Variable<'_>

type Target = str

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.