Create a zero-copy R view of a Julia array

Creates an ALTREP vector (or matrix, if 2D+) backed by Julia memory. The resulting R object shares the same memory as the Julia array, avoiding data copying. Modifications to the R object trigger copy-on-write (unless writeable = TRUE).

Usage

jlview(julia_array, writeable = FALSE, names = NULL, dimnames = NULL)

Arguments

julia_array

A JuliaObject referencing a Julia array

writeable

If TRUE, allow R to write directly to Julia's memory. Use with caution — this enables shared mutation. Default FALSE.

names

Optional character vector of names to attach to the result. Attached atomically during construction to avoid ALTREP materialization.

dimnames

Optional list of dimnames to attach to the result. Attached atomically during construction to avoid ALTREP materialization.

Value

An ALTREP vector backed by Julia memory, or a standard R vector if the Julia type is not supported for zero-copy.

Examples

if (FALSE) { # \dontrun{
JuliaCall::julia_setup()
# Create a Julia array and view it in R without copying
JuliaCall::julia_command("x = randn(1000)")
x <- jlview(JuliaCall::julia_eval("x"))
sum(x) # operates directly on Julia memory
} # }