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Wrap a writer into a read-only view via a 1-element chain.

Source: R/chain_daf.R
read_only.Rd

Returns a ReadOnlyChainDaf that reads from daf but rejects writes; there is no separate read-only wrapper class. As in Julia, read_only is the identity on data that is already read-only: if daf is a DafReadOnly and no name is given, daf itself is returned; passing a name always forces a fresh wrapper.

Usage

read_only(daf, name = NULL)

Arguments

daf

A DafReader (typically a DafWriter).

name

Optional chain name; defaults to daf_name(daf).

Value

daf itself if it is already read-only and name is NULL; otherwise a ReadOnlyChainDaf.

See also

chain_reader(), is_daf()

Examples

d <- memory_daf(name = "inner")
add_axis(d, "cell", c("c1", "c2"))
ro <- read_only(d)
daf_name(ro)
#> [1] "inner"
identical(read_only(ro), ro)
#> [1] TRUE