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MatchArgChoicesEntry

miniextendr_api::registry

Struct MatchArgChoicesEntry

pub struct MatchArgChoicesEntry {
    pub placeholder: &'static str,
    pub choices_str: fn() -> String,
    pub preferred_default: &'static str,
}

Expand description

Entry for replacing match_arg placeholder defaults with actual choices.

Fields§

§placeholder: &'static str

Placeholder string in the R formal default, e.g. ".__MX_MATCH_ARG_CHOICES_mode__".

§choices_str: fn() -> String

Function that returns the choices as a comma-separated quoted string, e.g. "\"Fast\", \"Safe\", \"Debug\"".

§preferred_default: &'static str

User-supplied default = "..." value (unquoted, e.g. "zstd"), or "" if the user did not supply one. When non-empty, the write-time pass rotates the choice list so this value appears first, so R’s match.arg(arg) (no second arg) picks it as the default.

Trait Implementations§

impl Sync for MatchArgChoicesEntry

Auto Trait Implementations§

impl Freeze for MatchArgChoicesEntry

impl RefUnwindSafe for MatchArgChoicesEntry

impl Send for MatchArgChoicesEntry

impl Unpin for MatchArgChoicesEntry

impl UnsafeUnpin for MatchArgChoicesEntry

impl UnwindSafe for MatchArgChoicesEntry

Blanket Implementations§

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

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type CastFrom = CastFromWrapper

impl<T> SizeEq<ManuallyDrop<T>> for T
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type CastFrom = CastFromWrapper

impl<T> SizeEq<MaybeUninit<T>> for T

type CastFrom = CastSizedExact

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type CastFrom = CastFromReadOnly

impl<T> SizeEq<T> for T
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type CastFrom = IdCast

impl<T> SizeEq<Unalign<T>> for T

type CastFrom = CastFromWrapper

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type CastFrom = CastFromWrapper

impl<T> SizeEq<Wrapping<T>> for T

type CastFrom = CastFromWrapper

impl<T> SizedTypeProperties for T

#[doc(hidden)]
const SIZE: usize = _

🔬This is a nightly-only experimental API. (sized_type_properties)

#[doc(hidden)]
const ALIGN: usize = _

🔬This is a nightly-only experimental API. (sized_type_properties)

#[doc(hidden)]
const ALIGNMENT: Alignment = _

🔬This is a nightly-only experimental API. (ptr_alignment_type)

#[doc(hidden)]
const IS_ZST: bool = _

🔬This is a nightly-only experimental API. (sized_type_properties)

true if this type requires no storage. false if its size is greater than zero. Read more

#[doc(hidden)]
const LAYOUT: Layout = _

🔬This is a nightly-only experimental API. (sized_type_properties)

#[doc(hidden)]
const MAX_SLICE_LEN: usize = _

🔬This is a nightly-only experimental API. (sized_type_properties)

The largest safe length for a [Self]. Read more

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where U: Into<T>,

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impl<Src, Dst> TransmuteFrom<Src, Valid, Initialized> for Dst
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impl<T> TransmuteFrom<Unalign<T>, Valid, Valid> for T

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Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 40 bytes