Trait Value 

pub trait Value: Sized + Display {
    const EXPECTED: &'static str;

    // Required method
    fn parse(text: &str) -> Option<Self>;

    // Provided method
    fn is_auto(&self) -> bool { ... }
}

A setting’s value type: parsed from and shown as the same text.

Required Associated Constants

const EXPECTED: &'static str

What the text may be, for error messages.

Required Methods

fn parse(text: &str) -> Option<Self>

The value text spells, or None when it is not one.

Provided Methods

fn is_auto(&self) -> bool

Computed from the machine rather than given.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl Value for bool

const EXPECTED: &'static str = "on or off"

fn parse(text: &str) -> Option<bool>

Implementors

impl Value for Amount

const EXPECTED: &'static str = "auto, a size (512M, 4G; a bare number is MiB) or a percentage (25%)"

impl Value for Bytes

const EXPECTED: &'static str = "a size (512M, 4G; a bare number is MiB)"

impl Value for CacheDir

const EXPECTED: &'static str = "a directory, or default"

impl Value for Count

const EXPECTED: &'static str = "auto or a number (0 counts as 1)"

impl Value for MaybePath

const EXPECTED: &'static str = "a file, or none"

impl Value for Millis

const EXPECTED: &'static str = "a duration (300, 2s; a bare number is milliseconds)"

impl Value for Name

const EXPECTED: &'static str = "a name"

impl Value for Names

const EXPECTED: &'static str = "names separated by `,` (or none)"

impl Value for Seconds

const EXPECTED: &'static str = "a duration (900, 15m; a bare number is seconds)"

impl Value for Tiers

const EXPECTED: &'static str = "a list of dex, derived, rendered (or all, none)"