Enum aws_sdk_ec2::model::VirtualizationType

#[non_exhaustive]
pub enum VirtualizationType {
    Hvm,
    Paravirtual,
    Unknown(UnknownVariantValue),
}

When writing a match expression against VirtualizationType, 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 virtualizationtype = unimplemented!();
match virtualizationtype {
    VirtualizationType::Hvm => { /* ... */ },
    VirtualizationType::Paravirtual => { /* ... */ },
    other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
    _ => { /* ... */ },
}

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

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.

Hvm

Paravirtual

Unknown(UnknownVariantValue)

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

Implementations

impl VirtualizationType

pub fn as_str(&self) -> &str

Returns the &str value of the enum member.

Examples found in repository

src/model.rs (line 12137)

    fn as_ref(&self) -> &str {
        self.as_str()
    }

src/query_ser.rs (line 1858)

pub fn serialize_structure_crate_model_instance_requirements_with_metadata_request(
    mut writer: aws_smithy_query::QueryValueWriter,
    input: &crate::model::InstanceRequirementsWithMetadataRequest,
) -> Result<(), aws_smithy_http::operation::error::SerializationError> {
    #[allow(unused_mut)]
    let mut scope_523 = writer.prefix("ArchitectureType");
    if let Some(var_524) = &input.architecture_types {
        let mut list_526 = scope_523.start_list(true, Some("item"));
        for item_525 in var_524 {
            #[allow(unused_mut)]
            let mut entry_527 = list_526.entry();
            entry_527.string(item_525.as_str());
        }
        list_526.finish();
    }
    #[allow(unused_mut)]
    let mut scope_528 = writer.prefix("VirtualizationType");
    if let Some(var_529) = &input.virtualization_types {
        let mut list_531 = scope_528.start_list(true, Some("item"));
        for item_530 in var_529 {
            #[allow(unused_mut)]
            let mut entry_532 = list_531.entry();
            entry_532.string(item_530.as_str());
        }
        list_531.finish();
    }
    #[allow(unused_mut)]
    let mut scope_533 = writer.prefix("InstanceRequirements");
    if let Some(var_534) = &input.instance_requirements {
        crate::query_ser::serialize_structure_crate_model_instance_requirements_request(
            scope_533, var_534,
        )?;
    }
    Ok(())
}

src/operation_ser.rs (line 15697)

pub fn serialize_operation_crate_operation_get_instance_types_from_instance_requirements(
    input: &crate::input::GetInstanceTypesFromInstanceRequirementsInput,
) -> Result<aws_smithy_http::body::SdkBody, aws_smithy_http::operation::error::SerializationError> {
    let mut out = String::new();
    #[allow(unused_mut)]
    let mut writer = aws_smithy_query::QueryWriter::new(
        &mut out,
        "GetInstanceTypesFromInstanceRequirements",
        "2016-11-15",
    );
    #[allow(unused_mut)]
    let mut scope_4396 = writer.prefix("DryRun");
    if let Some(var_4397) = &input.dry_run {
        scope_4396.boolean(*var_4397);
    }
    #[allow(unused_mut)]
    let mut scope_4398 = writer.prefix("ArchitectureType");
    if let Some(var_4399) = &input.architecture_types {
        let mut list_4401 = scope_4398.start_list(true, Some("item"));
        for item_4400 in var_4399 {
            #[allow(unused_mut)]
            let mut entry_4402 = list_4401.entry();
            entry_4402.string(item_4400.as_str());
        }
        list_4401.finish();
    }
    #[allow(unused_mut)]
    let mut scope_4403 = writer.prefix("VirtualizationType");
    if let Some(var_4404) = &input.virtualization_types {
        let mut list_4406 = scope_4403.start_list(true, Some("item"));
        for item_4405 in var_4404 {
            #[allow(unused_mut)]
            let mut entry_4407 = list_4406.entry();
            entry_4407.string(item_4405.as_str());
        }
        list_4406.finish();
    }
    #[allow(unused_mut)]
    let mut scope_4408 = writer.prefix("InstanceRequirements");
    if let Some(var_4409) = &input.instance_requirements {
        crate::query_ser::serialize_structure_crate_model_instance_requirements_request(
            scope_4408, var_4409,
        )?;
    }
    #[allow(unused_mut)]
    let mut scope_4410 = writer.prefix("MaxResults");
    if let Some(var_4411) = &input.max_results {
        scope_4410.number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_4411).into()),
        );
    }
    #[allow(unused_mut)]
    let mut scope_4412 = writer.prefix("NextToken");
    if let Some(var_4413) = &input.next_token {
        scope_4412.string(var_4413);
    }
    writer.finish();
    Ok(aws_smithy_http::body::SdkBody::from(out))
}

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

Returns all the &str values of the enum members.

Trait Implementations

impl AsRef<str> for VirtualizationType

fn as_ref(&self) -> &str

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

impl Clone for VirtualizationType

fn clone(&self) -> VirtualizationType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for VirtualizationType

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

Formats the value using the given formatter.

impl From<&str> for VirtualizationType

fn from(s: &str) -> Self

Converts to this type from the input type.

impl FromStr for VirtualizationType

type Err = Infallible

The associated error which can be returned from parsing.

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

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

impl Hash for VirtualizationType

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 VirtualizationType

fn cmp(&self, other: &VirtualizationType) -> 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<Self>,

Restrict a value to a certain interval.

impl PartialEq<VirtualizationType> for VirtualizationType

fn eq(&self, other: &VirtualizationType) -> 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<VirtualizationType> for VirtualizationType

fn partial_cmp(&self, other: &VirtualizationType) -> 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 VirtualizationType

impl StructuralEq for VirtualizationType

impl StructuralPartialEq for VirtualizationType