Enum aws_sdk_ec2::model::AllocationStrategy

#[non_exhaustive]
pub enum AllocationStrategy {
    CapacityOptimized,
    CapacityOptimizedPrioritized,
    Diversified,
    LowestPrice,
    Unknown(UnknownVariantValue),
}

When writing a match expression against AllocationStrategy, 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 allocationstrategy = unimplemented!();
match allocationstrategy {
    AllocationStrategy::CapacityOptimized => { /* ... */ },
    AllocationStrategy::CapacityOptimizedPrioritized => { /* ... */ },
    AllocationStrategy::Diversified => { /* ... */ },
    AllocationStrategy::LowestPrice => { /* ... */ },
    other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
    _ => { /* ... */ },
}

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

CapacityOptimized

CapacityOptimizedPrioritized

Diversified

LowestPrice

Unknown(UnknownVariantValue)

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

Implementations

impl AllocationStrategy

pub fn as_str(&self) -> &str

Returns the &str value of the enum member.

Examples found in repository

src/model.rs (line 29603)

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

src/query_ser.rs (line 2879)

pub fn serialize_structure_crate_model_spot_fleet_request_config_data(
    mut writer: aws_smithy_query::QueryValueWriter,
    input: &crate::model::SpotFleetRequestConfigData,
) -> Result<(), aws_smithy_http::operation::error::SerializationError> {
    #[allow(unused_mut)]
    let mut scope_815 = writer.prefix("AllocationStrategy");
    if let Some(var_816) = &input.allocation_strategy {
        scope_815.string(var_816.as_str());
    }
    #[allow(unused_mut)]
    let mut scope_817 = writer.prefix("OnDemandAllocationStrategy");
    if let Some(var_818) = &input.on_demand_allocation_strategy {
        scope_817.string(var_818.as_str());
    }
    #[allow(unused_mut)]
    let mut scope_819 = writer.prefix("SpotMaintenanceStrategies");
    if let Some(var_820) = &input.spot_maintenance_strategies {
        crate::query_ser::serialize_structure_crate_model_spot_maintenance_strategies(
            scope_819, var_820,
        )?;
    }
    #[allow(unused_mut)]
    let mut scope_821 = writer.prefix("ClientToken");
    if let Some(var_822) = &input.client_token {
        scope_821.string(var_822);
    }
    #[allow(unused_mut)]
    let mut scope_823 = writer.prefix("ExcessCapacityTerminationPolicy");
    if let Some(var_824) = &input.excess_capacity_termination_policy {
        scope_823.string(var_824.as_str());
    }
    #[allow(unused_mut)]
    let mut scope_825 = writer.prefix("FulfilledCapacity");
    if let Some(var_826) = &input.fulfilled_capacity {
        scope_825.number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::Float((*var_826).into()),
        );
    }
    #[allow(unused_mut)]
    let mut scope_827 = writer.prefix("OnDemandFulfilledCapacity");
    if let Some(var_828) = &input.on_demand_fulfilled_capacity {
        scope_827.number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::Float((*var_828).into()),
        );
    }
    #[allow(unused_mut)]
    let mut scope_829 = writer.prefix("IamFleetRole");
    if let Some(var_830) = &input.iam_fleet_role {
        scope_829.string(var_830);
    }
    #[allow(unused_mut)]
    let mut scope_831 = writer.prefix("LaunchSpecifications");
    if let Some(var_832) = &input.launch_specifications {
        let mut list_834 = scope_831.start_list(true, Some("item"));
        for item_833 in var_832 {
            #[allow(unused_mut)]
            let mut entry_835 = list_834.entry();
            crate::query_ser::serialize_structure_crate_model_spot_fleet_launch_specification(
                entry_835, item_833,
            )?;
        }
        list_834.finish();
    }
    #[allow(unused_mut)]
    let mut scope_836 = writer.prefix("LaunchTemplateConfigs");
    if let Some(var_837) = &input.launch_template_configs {
        let mut list_839 = scope_836.start_list(true, Some("item"));
        for item_838 in var_837 {
            #[allow(unused_mut)]
            let mut entry_840 = list_839.entry();
            crate::query_ser::serialize_structure_crate_model_launch_template_config(
                entry_840, item_838,
            )?;
        }
        list_839.finish();
    }
    #[allow(unused_mut)]
    let mut scope_841 = writer.prefix("SpotPrice");
    if let Some(var_842) = &input.spot_price {
        scope_841.string(var_842);
    }
    #[allow(unused_mut)]
    let mut scope_843 = writer.prefix("TargetCapacity");
    if let Some(var_844) = &input.target_capacity {
        scope_843.number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_844).into()),
        );
    }
    #[allow(unused_mut)]
    let mut scope_845 = writer.prefix("OnDemandTargetCapacity");
    if let Some(var_846) = &input.on_demand_target_capacity {
        scope_845.number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_846).into()),
        );
    }
    #[allow(unused_mut)]
    let mut scope_847 = writer.prefix("OnDemandMaxTotalPrice");
    if let Some(var_848) = &input.on_demand_max_total_price {
        scope_847.string(var_848);
    }
    #[allow(unused_mut)]
    let mut scope_849 = writer.prefix("SpotMaxTotalPrice");
    if let Some(var_850) = &input.spot_max_total_price {
        scope_849.string(var_850);
    }
    #[allow(unused_mut)]
    let mut scope_851 = writer.prefix("TerminateInstancesWithExpiration");
    if let Some(var_852) = &input.terminate_instances_with_expiration {
        scope_851.boolean(*var_852);
    }
    #[allow(unused_mut)]
    let mut scope_853 = writer.prefix("Type");
    if let Some(var_854) = &input.r#type {
        scope_853.string(var_854.as_str());
    }
    #[allow(unused_mut)]
    let mut scope_855 = writer.prefix("ValidFrom");
    if let Some(var_856) = &input.valid_from {
        scope_855.date_time(var_856, aws_smithy_types::date_time::Format::DateTime)?;
    }
    #[allow(unused_mut)]
    let mut scope_857 = writer.prefix("ValidUntil");
    if let Some(var_858) = &input.valid_until {
        scope_857.date_time(var_858, aws_smithy_types::date_time::Format::DateTime)?;
    }
    #[allow(unused_mut)]
    let mut scope_859 = writer.prefix("ReplaceUnhealthyInstances");
    if let Some(var_860) = &input.replace_unhealthy_instances {
        scope_859.boolean(*var_860);
    }
    #[allow(unused_mut)]
    let mut scope_861 = writer.prefix("InstanceInterruptionBehavior");
    if let Some(var_862) = &input.instance_interruption_behavior {
        scope_861.string(var_862.as_str());
    }
    #[allow(unused_mut)]
    let mut scope_863 = writer.prefix("LoadBalancersConfig");
    if let Some(var_864) = &input.load_balancers_config {
        crate::query_ser::serialize_structure_crate_model_load_balancers_config(
            scope_863, var_864,
        )?;
    }
    #[allow(unused_mut)]
    let mut scope_865 = writer.prefix("InstancePoolsToUseCount");
    if let Some(var_866) = &input.instance_pools_to_use_count {
        scope_865.number(
            #[allow(clippy::useless_conversion)]
            aws_smithy_types::Number::NegInt((*var_866).into()),
        );
    }
    #[allow(unused_mut)]
    let mut scope_867 = writer.prefix("Context");
    if let Some(var_868) = &input.context {
        scope_867.string(var_868);
    }
    #[allow(unused_mut)]
    let mut scope_869 = writer.prefix("TargetCapacityUnitType");
    if let Some(var_870) = &input.target_capacity_unit_type {
        scope_869.string(var_870.as_str());
    }
    #[allow(unused_mut)]
    let mut scope_871 = writer.prefix("TagSpecification");
    if let Some(var_872) = &input.tag_specifications {
        let mut list_874 = scope_871.start_list(true, Some("item"));
        for item_873 in var_872 {
            #[allow(unused_mut)]
            let mut entry_875 = list_874.entry();
            crate::query_ser::serialize_structure_crate_model_tag_specification(
                entry_875, item_873,
            )?;
        }
        list_874.finish();
    }
    Ok(())
}

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

Returns all the &str values of the enum members.

Trait Implementations

impl AsRef<str> for AllocationStrategy

fn as_ref(&self) -> &str

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

impl Clone for AllocationStrategy

fn clone(&self) -> AllocationStrategy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for AllocationStrategy

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

Formats the value using the given formatter.

impl From<&str> for AllocationStrategy

fn from(s: &str) -> Self

Converts to this type from the input type.

impl FromStr for AllocationStrategy

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 AllocationStrategy

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 AllocationStrategy

fn cmp(&self, other: &AllocationStrategy) -> 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<AllocationStrategy> for AllocationStrategy

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

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

impl StructuralEq for AllocationStrategy

impl StructuralPartialEq for AllocationStrategy