Enum aws_sdk_s3::types::ChecksumAlgorithm

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#[non_exhaustive]
pub enum ChecksumAlgorithm { Crc32, Crc32C, Sha1, Sha256, Unknown(UnknownVariantValue), }
Expand description

When writing a match expression against ChecksumAlgorithm, 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 checksumalgorithm = unimplemented!();
match checksumalgorithm {
    ChecksumAlgorithm::Crc32 => { /* ... */ },
    ChecksumAlgorithm::Crc32C => { /* ... */ },
    ChecksumAlgorithm::Sha1 => { /* ... */ },
    ChecksumAlgorithm::Sha256 => { /* ... */ },
    other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
    _ => { /* ... */ },
}

The above code demonstrates that when checksumalgorithm represents NewFeature, the execution path will lead to the second last match arm, even though the enum does not contain a variant ChecksumAlgorithm::NewFeature in the current version of SDK. The reason is that the variable other, created by the @ operator, is bound to ChecksumAlgorithm::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 ChecksumAlgorithm::NewFeature is defined. Specifically, when checksumalgorithm represents NewFeature, the execution path will hit the second last match arm as before by virtue of calling as_str on ChecksumAlgorithm::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.

Variants (Non-exhaustive)§

This enum is marked as 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.
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Crc32

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Crc32C

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Sha1

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Sha256

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Unknown(UnknownVariantValue)

👎Deprecated: Don’t directly match on Unknown. See the docs on this enum for the correct way to handle unknown variants.

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

Implementations§

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impl ChecksumAlgorithm

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pub fn as_str(&self) -> &str

Returns the &str value of the enum member.

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

Returns all the &str representations of the enum members.

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impl ChecksumAlgorithm

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pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>

Parses the enum value while disallowing unknown variants.

Unknown variants will result in an error.

Trait Implementations§

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impl AsRef<str> for ChecksumAlgorithm

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fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.
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impl Clone for ChecksumAlgorithm

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fn clone(&self) -> ChecksumAlgorithm

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ChecksumAlgorithm

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

Formats the value using the given formatter. Read more
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impl Display for ChecksumAlgorithm

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

Formats the value using the given formatter. Read more
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impl From<&str> for ChecksumAlgorithm

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fn from(s: &str) -> Self

Converts to this type from the input type.
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impl FromStr for ChecksumAlgorithm

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type Err = Infallible

The associated error which can be returned from parsing.
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fn from_str(s: &str) -> Result<Self, <Self as FromStr>::Err>

Parses a string s to return a value of this type. Read more
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impl Hash for ChecksumAlgorithm

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for ChecksumAlgorithm

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

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for ChecksumAlgorithm

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

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

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Eq for ChecksumAlgorithm

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impl StructuralPartialEq for ChecksumAlgorithm

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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where T: ?Sized,

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Immutably borrows from an owned value. Read more
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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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Compare self to key and return their ordering.
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