Struct StructEnumAttrs 

struct StructEnumAttrs {
    class: Option<String>,
    base: Option<String>,
    list: bool,
    dataframe: bool,
    externalptr: bool,
    match_arg: bool,
    factor: bool,
    prefer: Option<String>,
}

Parsed attributes for #[miniextendr] on structs/enums.

These attributes control which derive path is taken when #[miniextendr] is applied to a struct or enum.

Fields

class: Option<String>

ALTREP class name override (forwarded to the ALTREP derive path).

base: Option<String>

ALTREP base type override (forwarded to the ALTREP derive path).

list: bool

Derive IntoList + TryFromList + PreferList for struct-to-list round-tripping.

dataframe: bool

Derive DataFrameRow for struct-to-data-frame conversion.

externalptr: bool

Force ExternalPtr derive even on single-field structs (which default to ALTREP).

match_arg: bool

Derive MatchArg for enum (single-selection from R character scalar).

factor: bool

Derive RFactor for enum (R factor representation).

prefer: Option<String>

Preference marker string: "externalptr", "list", "dataframe", or "native". Acts as a soft mode selector when no explicit mode attribute is set.

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: 80 bytes