Enum FeatureState 

pub enum FeatureState<T> {
    Enabled(T),
    Disabled,
}

Whether an optional TOML section is present and active.

load_optional_section returns Enabled(T) when the key exists in any config file and Disabled when it is absent from all of them.

Variants

Enabled(T)

The section key is present in TOML and deserialized successfully into T.

Disabled

The section key is absent from every config file – the feature is off.

Trait Implementations

impl<T: Clone> Clone for FeatureState<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for FeatureState<T>

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

Formats the value using the given formatter.

impl<T> FeatureStateOps for FeatureState<T>

type Value = T

The inner value type when the state is enabled.

fn is_enabled(&self) -> bool

Return true when the state holds an enabled value.

fn is_disabled(&self) -> bool

Return true when the state is disabled.

fn into_option(self) -> Option<Self::Value>

Convert into an Option<Self::Value>, discarding disabled states.

fn as_option(&self) -> Option<&Self::Value>

Borrow the inner value when enabled.

fn map<U>(self, f: impl FnOnce(Self::Value) -> U) -> FeatureState<U>

Map the inner value when enabled.

fn and_then<U>( self, f: impl FnOnce(Self::Value) -> FeatureState<U>, ) -> FeatureState<U>

Chain another state-producing operation when enabled.

fn unwrap_or(self, default: Self::Value) -> Self::Value

Return the inner value or the provided default when disabled.

fn unwrap_or_else(self, f: impl FnOnce() -> Self::Value) -> Self::Value

Return the inner value or compute one lazily when disabled.

fn enabled_or_default(self) -> Self::Value

where Self::Value: Default,

Return the enabled value or Self::Value::default() when disabled.

impl<T> From<FeatureState<T>> for Option<T>

fn from(state: FeatureState<T>) -> Self

Converts to this type from the input type.

impl<T> From<Option<T>> for FeatureState<T>

fn from(opt: Option<T>) -> Self

Converts to this type from the input type.

impl<T: PartialEq> PartialEq for FeatureState<T>

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

Equality operator ==.

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

Inequality operator !=.