Return the closure environment of a function.
Closure environments define the scope of functions (see
env()). When a function call is evaluated, R creates
an evaluation frame (see
eval_stack()) that inherits
from the closure environment. This makes all objects defined in the
closure environment and all its parents available to code executed
within the function.
fn_env(fn)fn_env(x) <- value
- fn, x
- A function.
- A new closure environment for the function.
fn_env() returns the closure environment of
is also an assignment method to set a new closure environment.
env <- new_env("base") fn <- with_env(env, function() NULL) identical(fn_env(fn), env) other_env <- new_env("base") fn_env(fn) <- other_env identical(fn_env(fn), other_env)