Struct ColumnReg 

struct ColumnReg {
    alloc: Box<dyn FnOnce(usize) -> (ColumnKind, ColPtr) + Send>,
    make_filler: Box<dyn FnOnce(ColPtr, usize) -> Box<dyn Fn(usize, usize) + Send + Sync> + Send>,
}

One registered column: a serial allocation step plus the range filler that the flattened work-list (or serial loop) dispatches.

Fields

alloc: Box<dyn FnOnce(usize) -> (ColumnKind, ColPtr) + Send>

Allocates the column’s backing storage (R SEXP for native columns, an owned Vec for character columns) for nrow rows. Runs serially on the R/worker thread. Returns the ColumnKind (carrying the protected SEXP or the owned buffer) and the raw data pointer the range filler writes through during the fill phase.

make_filler: Box<dyn FnOnce(ColPtr, usize) -> Box<dyn Fn(usize, usize) + Send + Sync> + Send>

Builds the type-erased range filler once the data pointer is known.

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: 32 bytes