Trait Declared 

pub trait Declared:
    Copy
    + Eq
    + 'static {
    type Caps;

    const FALLBACK_CODE: ErrorCode;
    const REFUSED_CODE: ErrorCode;

    // Required methods
    fn name(self) -> &'static str;
    fn lacks(self, caps: &Self::Caps) -> Option<String>;
    fn fallback(self) -> Option<Self>;
}

A setting value with a declared fallback chain.

Required Associated Constants

const FALLBACK_CODE: ErrorCode

The code of the warning a fallback emits: (requested, why, running).

const REFUSED_CODE: ErrorCode

The code of the refusal a strict setting emits: (requested, why).

Required Associated Types

type Caps

What the host offers, probed once by the host (never by the core).

Required Methods

fn name(self) -> &'static str

The value’s spelling.

fn lacks(self, caps: &Self::Caps) -> Option<String>

Why self cannot run on caps, or None when it can.

fn fallback(self) -> Option<Self>

The declared fallback of self (None: the end of the chain, which must run anywhere).

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors

impl Declared for ExecutorKind

const FALLBACK_CODE: ErrorCode = ErrorCode::ExecutorFallback

const REFUSED_CODE: ErrorCode = ErrorCode::ExecutorRefused

type Caps = ExecutorCaps