Enum InputVariance 

pub enum InputVariance {
    Fixed,
    Error,
    Warn,
    Info,
}

What the compiler does with an open input, one whose type it inferred rather than the author declared: an auto-extern, or an extern a scope builder synthesized (input_variance.md §3, §4). Coordinates and declared inputs are never affected.

A converted input costs a converter node, which on the compiled engines is a closure step or a slot call from native code, run when the input changes (input_variance.md §5). A declared input and an open input under Fixed cost nothing, so conversion is asked for, never assumed.

Variants

Fixed

An open input takes its inferred type, and a write of another type is refused.

Error

An open input stops construction, naming it: every input’s type must be declared.

Warn

Every open input takes any value and gets a converter node to the type its consumers read, each reported as a warning.

Info

As Warn, each converter reported as info.

Trait Implementations

impl Clone for InputVariance

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for InputVariance

impl Debug for InputVariance

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

Formats the value using the given formatter.

impl Default for InputVariance

fn default() -> Self

Returns the “default value” for a type.

impl Eq for InputVariance

impl PartialEq for InputVariance

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for InputVariance