shared_vector: Create a shared vector from a segment

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

Create a shared vector from a segment

Description

Create a shared vector from a segment

Usage

shared_vector(
  segment,
  type = c("double", "integer", "logical", "raw"),
  offset = 0,
  length = NULL,
  readonly = TRUE,
  cow = NULL
)

Arguments

segment	A shard_segment object
type	Vector type: "integer", "double"/"numeric", "logical", or "raw"
offset	Byte offset into segment (default: 0)
length	Number of elements. If NULL, calculated from segment size.
readonly	If TRUE, prevent write access via DATAPTR (default: TRUE)
cow	Copy-on-write policy for mutation attempts. One of "deny", "audit", or "allow". If NULL, defaults to "deny" when readonly=TRUE and "allow" otherwise.

Value

An ALTREP vector backed by shared memory

Examples

seg <- segment_create(400)
segment_write(seg, 1:100, offset = 0)

x <- shared_vector(seg, "integer", length = 100)
x[1:10]

shared_diagnostics(x)

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