Create a function by "hand"
This constructs a new function given it's three components: list of arguments, body code and parent environment.
fn_new(args, body, env = env_caller())
- A named list of default arguments. Note that if you want
arguments that don't have defaults, you'll need to use the special function
alist(a = , b = 1)
- A language object representing the code inside the function.
Usually this will be most easily generated with
- The parent environment of the function, defaults to the calling
f <- function(x) x + 3 g <- fn_new(alist(x = ), quote(x + 3)) # The components of the functions are identical identical(formals(f), formals(g)) identical(body(f), body(g)) identical(environment(f), environment(g)) # But the functions are not identical because f has src code reference identical(f, g) attr(f, "srcref") <- NULL # Now they are: stopifnot(identical(f, g))
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