with_connection {withr}

Connections which close themselves

Description

R file connections which are automatically closed.

Usage

with_connection(con, code)

local_connection(con, .local_envir = parent.frame())

Arguments

con

For with_connection() a named list with the connection(s) to create. For local_connection() the code to create a single connection, which is then returned.

code

[any]
Code to execute in the temporary environment

.local_envir

⁠[environment]⁠
The environment to use for scoping.

Value

[any]
The results of the evaluation of the code argument.

See Also

withr for examples

Examples

with_connection(list(con = file("foo", "w")), {
  writeLines(c("foo", "bar"), con)
})

read_foo <- function() {
  readLines(local_connection(file("foo", "r")))
}
read_foo()

unlink("foo")