ref: Create a reference to R object
In renkun-ken/reflite: A Lightweight Reference Object Implementation

Description Usage Arguments Examples

Create a ref as a wrapper of a given object. A ref is essentially a wrapper environment of the object.

1	ref(object = NULL, constraint = NULL)

`object`	The object.
`constraint`	a function to validate the value in each update of the object.

# create a NULL ref
ref()

# create a ref of an integer vector
x <- ref(1:10)
x[1]
x[5] <- 10L

# create a ref with constraint of an integer vector
x <- ref(1:10, is.integer)
x[1]
x[5] <- 10L
# x[5] <- "a" will corece 1:10 to character vector
# but violates is.integer contraint, leading to a stop.