as_shared: Create a shared vector from an existing R vector

In shard: Deterministic, Zero-Copy Parallel Execution for R

Create a shared vector from an existing R vector

Description

Convenience function that creates a segment, writes the data, and returns an ALTREP view.

Usage

as_shared(x, readonly = TRUE, backing = "auto", cow = NULL)

Arguments

x	An atomic vector (integer, double, logical, or raw)
readonly	If TRUE, prevent write access (default: TRUE)
backing	Backing type for the segment: "auto", "mmap", or "shm"
cow	Copy-on-write policy for the resulting shared vector. One of "deny", "audit", or "allow". If NULL, defaults based on readonly.

Value

An ALTREP vector backed by shared memory

Examples

x <- as_shared(1:100)
is_shared_vector(x)

y <- x[1:10]
is_shared_vector(y)

shard documentation built on April 3, 2026, 9:08 a.m.