aws_sdk_opsworks/types/
_root_device_type.rs

1// Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.
2
3/// When writing a match expression against `RootDeviceType`, it is important to ensure
4/// your code is forward-compatible. That is, if a match arm handles a case for a
5/// feature that is supported by the service but has not been represented as an enum
6/// variant in a current version of SDK, your code should continue to work when you
7/// upgrade SDK to a future version in which the enum does include a variant for that
8/// feature.
9///
10/// Here is an example of how you can make a match expression forward-compatible:
11///
12/// ```text
13/// # let rootdevicetype = unimplemented!();
14/// match rootdevicetype {
15///     RootDeviceType::Ebs => { /* ... */ },
16///     RootDeviceType::InstanceStore => { /* ... */ },
17///     other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
18///     _ => { /* ... */ },
19/// }
20/// ```
21/// The above code demonstrates that when `rootdevicetype` represents
22/// `NewFeature`, the execution path will lead to the second last match arm,
23/// even though the enum does not contain a variant `RootDeviceType::NewFeature`
24/// in the current version of SDK. The reason is that the variable `other`,
25/// created by the `@` operator, is bound to
26/// `RootDeviceType::Unknown(UnknownVariantValue("NewFeature".to_owned()))`
27/// and calling `as_str` on it yields `"NewFeature"`.
28/// This match expression is forward-compatible when executed with a newer
29/// version of SDK where the variant `RootDeviceType::NewFeature` is defined.
30/// Specifically, when `rootdevicetype` represents `NewFeature`,
31/// the execution path will hit the second last match arm as before by virtue of
32/// calling `as_str` on `RootDeviceType::NewFeature` also yielding `"NewFeature"`.
33///
34/// Explicitly matching on the `Unknown` variant should
35/// be avoided for two reasons:
36/// - The inner data `UnknownVariantValue` is opaque, and no further information can be extracted.
37/// - It might inadvertently shadow other intended match arms.
38///
39#[allow(missing_docs)] // documentation missing in model
40#[non_exhaustive]
41#[derive(
42    ::std::clone::Clone, ::std::cmp::Eq, ::std::cmp::Ord, ::std::cmp::PartialEq, ::std::cmp::PartialOrd, ::std::fmt::Debug, ::std::hash::Hash,
43)]
44pub enum RootDeviceType {
45    #[allow(missing_docs)] // documentation missing in model
46    Ebs,
47    #[allow(missing_docs)] // documentation missing in model
48    InstanceStore,
49    /// `Unknown` contains new variants that have been added since this code was generated.
50    #[deprecated(note = "Don't directly match on `Unknown`. See the docs on this enum for the correct way to handle unknown variants.")]
51    Unknown(crate::primitives::sealed_enum_unknown::UnknownVariantValue),
52}
53impl ::std::convert::From<&str> for RootDeviceType {
54    fn from(s: &str) -> Self {
55        match s {
56            "ebs" => RootDeviceType::Ebs,
57            "instance-store" => RootDeviceType::InstanceStore,
58            other => RootDeviceType::Unknown(crate::primitives::sealed_enum_unknown::UnknownVariantValue(other.to_owned())),
59        }
60    }
61}
62impl ::std::str::FromStr for RootDeviceType {
63    type Err = ::std::convert::Infallible;
64
65    fn from_str(s: &str) -> ::std::result::Result<Self, <Self as ::std::str::FromStr>::Err> {
66        ::std::result::Result::Ok(RootDeviceType::from(s))
67    }
68}
69impl RootDeviceType {
70    /// Returns the `&str` value of the enum member.
71    pub fn as_str(&self) -> &str {
72        match self {
73            RootDeviceType::Ebs => "ebs",
74            RootDeviceType::InstanceStore => "instance-store",
75            RootDeviceType::Unknown(value) => value.as_str(),
76        }
77    }
78    /// Returns all the `&str` representations of the enum members.
79    pub const fn values() -> &'static [&'static str] {
80        &["ebs", "instance-store"]
81    }
82}
83impl ::std::convert::AsRef<str> for RootDeviceType {
84    fn as_ref(&self) -> &str {
85        self.as_str()
86    }
87}
88impl RootDeviceType {
89    /// Parses the enum value while disallowing unknown variants.
90    ///
91    /// Unknown variants will result in an error.
92    pub fn try_parse(value: &str) -> ::std::result::Result<Self, crate::error::UnknownVariantError> {
93        match Self::from(value) {
94            #[allow(deprecated)]
95            Self::Unknown(_) => ::std::result::Result::Err(crate::error::UnknownVariantError::new(value)),
96            known => Ok(known),
97        }
98    }
99}
100impl ::std::fmt::Display for RootDeviceType {
101    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
102        match self {
103            RootDeviceType::Ebs => write!(f, "ebs"),
104            RootDeviceType::InstanceStore => write!(f, "instance-store"),
105            RootDeviceType::Unknown(value) => write!(f, "{}", value),
106        }
107    }
108}
aws_sdk_opsworks/types/_root_device_type.rs

aws_sdk_opsworks/types/
_root_device_type.rs
