Enum aws_sdk_ssmsap::types::ApplicationStatus

#[non_exhaustive]
pub enum ApplicationStatus {
    Activated,
    Deleting,
    Failed,
    Registering,
    Starting,
    Stopped,
    Stopping,
    UnknownValue,
    Unknown(UnknownVariantValue),
}

When writing a match expression against ApplicationStatus, it is important to ensure your code is forward-compatible. That is, if a match arm handles a case for a feature that is supported by the service but has not been represented as an enum variant in a current version of SDK, your code should continue to work when you upgrade SDK to a future version in which the enum does include a variant for that feature.

Here is an example of how you can make a match expression forward-compatible:

# let applicationstatus = unimplemented!();
match applicationstatus {
    ApplicationStatus::Activated => { /* ... */ },
    ApplicationStatus::Deleting => { /* ... */ },
    ApplicationStatus::Failed => { /* ... */ },
    ApplicationStatus::Registering => { /* ... */ },
    ApplicationStatus::Starting => { /* ... */ },
    ApplicationStatus::Stopped => { /* ... */ },
    ApplicationStatus::Stopping => { /* ... */ },
    ApplicationStatus::UnknownValue => { /* ... */ },
    other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
    _ => { /* ... */ },
}

The above code demonstrates that when applicationstatus represents NewFeature, the execution path will lead to the second last match arm, even though the enum does not contain a variant ApplicationStatus::NewFeature in the current version of SDK. The reason is that the variable other, created by the @ operator, is bound to ApplicationStatus::Unknown(UnknownVariantValue("NewFeature".to_owned())) and calling as_str on it yields "NewFeature". This match expression is forward-compatible when executed with a newer version of SDK where the variant ApplicationStatus::NewFeature is defined. Specifically, when applicationstatus represents NewFeature, the execution path will hit the second last match arm as before by virtue of calling as_str on ApplicationStatus::NewFeature also yielding "NewFeature".

Explicitly matching on the Unknown variant should be avoided for two reasons:

• The inner data UnknownVariantValue is opaque, and no further information can be extracted.
• It might inadvertently shadow other intended match arms. Note: ApplicationStatus::Unknown has been renamed to ::UnknownValue.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Activated

Deleting

Failed

Registering

Starting

Stopped

Stopping

UnknownValue

Note: ::Unknown has been renamed to ::UnknownValue.

Unknown(UnknownVariantValue)

Unknown contains new variants that have been added since this code was generated.

Implementations

impl ApplicationStatus

pub fn as_str(&self) -> &str

Returns the &str value of the enum member.

pub const fn values() -> &'static [&'static str]

Returns all the &str representations of the enum members.

Trait Implementations

impl AsRef<str> for ApplicationStatus

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for ApplicationStatus

fn clone(&self) -> ApplicationStatus

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ApplicationStatus

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

Formats the value using the given formatter.

impl From<&str> for ApplicationStatus

fn from(s: &str) -> Self

Converts to this type from the input type.

impl FromStr for ApplicationStatus

type Err = Infallible

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, <Self as FromStr>::Err>

Parses a string s to return a value of this type.

impl Hash for ApplicationStatus

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for ApplicationStatus

fn cmp(&self, other: &ApplicationStatus) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for ApplicationStatus

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for ApplicationStatus

fn partial_cmp(&self, other: &ApplicationStatus) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for ApplicationStatus

impl StructuralEq for ApplicationStatus

impl StructuralPartialEq for ApplicationStatus