rlang: call_fn – R documentation

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call_fn

Extract function from a call

Description

If a frame or formula, the function will be retrieved from the associated environment. Otherwise, it is looked up in the calling frame.

Usage

call_fn(call, env = caller_env())

Arguments

`call`	Can be a call or a quosure that wraps a call.
`env`	The environment where to find the definition of the function quoted in `call` in case `call` is not wrapped in a quosure.

Life cycle

In rlang 0.2.0, lang_fn() was deprecated and renamed to call_fn(). See lifecycle section in call2() for more about this change.

Examples

# Extract from a quoted call:
call_fn(quote(matrix()))
call_fn(quo(matrix()))

# Extract the calling function
test <- function() call_fn(call_frame())
test()

rlang

Functions for Base Types and Core R and 'Tidyverse' Features

v0.4.11

MIT + file LICENSE

Authors

Lionel Henry [aut, cre], Hadley Wickham [aut], mikefc [cph] (Hash implementation based on Mike's xxhashlite), Yann Collet [cph] (Author of the embedded xxHash library), RStudio [cph]

Initial release