Trait FromSetting 

pub trait FromSetting<'a>: Sized {
    const EXPECTED: &'static str;

    // Required method
    fn from_setting(value: &'a Document) -> Option<Self>;
}

Converts a settings value into a type, optionally borrowing from the document.

Protocols can implement this trait for their own settings types. Return None when the value is invalid; get reports it as a configuration error.

Required Associated Constants

const EXPECTED: &'static str

The expected type or value, used in configuration error diagnostics.

Required Methods

fn from_setting(value: &'a Document) -> Option<Self>

Converts a value, returning None if it does not match this type.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl FromSetting<'_> for bool

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

fn from_setting(value: &Document) -> Option<Self>

impl FromSetting<'_> for u64

const EXPECTED: &'static str = "a non-negative integer"

fn from_setting(value: &Document) -> Option<Self>

impl FromSetting<'_> for String

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

fn from_setting(value: &Document) -> Option<Self>

impl<'a> FromSetting<'a> for &'a str

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

fn from_setting(value: &'a Document) -> Option<Self>

Implementors