R file connections which are automatically closed.

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()
#> [1] "foo" "bar"