Enum Provenance 

pub enum Provenance {
    Default,
    Explicit,
}

Whether a configuration value was set explicitly, or merely defaulted.

A configuration source generally supplies every setting it knows about, including settings nobody configured, so a value on its own cannot say whether anything set it. A setting whose meaning depends on that question needs the distinction; a setting that only needs an effective value can ignore it.

Variants

Default

Nothing set the setting, so it holds a default.

This is the provenance of a value the model defaulted itself and of a value a source supplied from its own defaults.

Explicit

Some input set this value: a configuration file, an environment variable, remote configuration, and so on.

Trait Implementations

impl Clone for Provenance

fn clone(&self) -> Provenance

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Provenance

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

Formats the value using the given formatter.

impl Default for Provenance

fn default() -> Provenance

Returns the “default value” for a type.

impl PartialEq for Provenance

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Provenance

impl Eq for Provenance

impl StructuralPartialEq for Provenance