Skip to contents

FFI Union Type

Source: R/00-types.R
UnionType.Rd

FFI Union Type

Usage

UnionType(
  name = character(0),
  size = integer(0),
  ref = NULL,
  fields = character(0),
  field_types = list(),
  pack = NULL,
  has_packed_change = logical(0)
)

Arguments

name

Character name of the type

size

Integer size in bytes

ref

External pointer to ffi_type

fields

Character vector of field names

field_types

List of FFIType objects for each field

pack

Integer packing alignment (NULL for default/natural alignment)

has_packed_change

Logical indicating if packing changes alignment from natural. When TRUE, the union cannot be passed by value to C functions (only pointers work) because libffi doesn't support packed unions.