Struct Output 

pub struct Output(/* private fields */);

A write destination: an Expr<Path>, folded when literal.

The engine records every destination it writes through, in each Change’s path, so a config’s visit reports an Output as recorded whether or not its field says records.

Implementations

impl Output

pub fn path(&self) -> &Expr<Path>

The destination expression.

pub fn constant(&self) -> Option<&Path>

The destination when it is a literal path, resolved at compile time.

Trait Implementations

impl ConfigField for Output

fn visit(&self, v: &mut Visit<'_>)

Visited as recorded, wherever it sits: a destination lands in every Change written through it, so it may not read a secret.

fn resolve(&self, r: &mut dyn Resolver) -> Result<Option<OwnedDataValue>>

The destination’s dotted text, computed for this call when it is not literal.

const IS_OUTPUT: bool = true

Whether the field is an output: a destination its call writes to. false unless the type is Output or an Option of one. The derive reads a field typed Output or marked #[output] as an output and asserts that this is true, so a type that merely shares the name is refused at compile time.

fn compile(raw: &Value, cx: &mut CompileCx<'_>) -> Option<Self>

Compiles raw; None after recording at least one issue.

fn kind() -> FieldKind

What the field is.

const NULL_IS_VALUE: bool = false

Whether null is one of the type’s values. When it is not, an explicit null in an Option<Self> field means None.

fn absent() -> Option<Self>

The value when the key is absent and no default is declared. None makes the field required.

impl Debug for Output

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

Formats the value using the given formatter.