pub fn derive_altrep_real(input: DeriveInput) -> Result<TokenStream>Expand description
Derive macro entry point for AltrepReal.
Auto-implements AltrepLen and AltRealData for a struct with a length field.
The elt() method returns self.{elt_field} as f64 if #[altrep(elt = "...")]
is specified, or f64::NAN (R’s NA_real_) by default.
Supports #[altrep(dataptr)] for direct f64 data pointer access and
#[altrep(subset)] for Extract_subset.