crate: Isolate a Function from its Environment

In mlr3misc: Helper Functions for 'mlr3'

Isolate a Function from its Environment

Description

Put a function in a "lean" environment that does not carry unnecessary baggage with it (e.g. references to datasets).

Usage

crate(.fn, ..., .parent = topenv(parent.frame()), .compile = TRUE)

Arguments

.fn	(⁠function()⁠) function to crate
...	(any) The objects, which should be visible inside .fn.
.parent	(environment) Parent environment to look up names. Default to topenv().
.compile	(logical(1)) Whether to jit-compile the function. In case the function is already compiled. If the input function .fn is compiled, this has no effect, and the output function will always be compiled.

Examples

meta_f = function(z) {
  x = 1
  y = 2
  crate(function() {
    c(x, y, z)
  }, x)
}
x = 100
y = 200
z = 300
f = meta_f(1)
f()

mlr3misc documentation built on Sept. 13, 2025, 1:10 a.m.