attach_eval: Evaluate R expressions in an attached environment.

Description Usage Arguments Value Examples

View source: R/attach_eval.R

Description

Evaluate R expressions in an attached environment.

Usage

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attach_eval(
  unquoted_expr,
  name = "local:utils",
  pos = 2L,
  warn.conflicts = TRUE,
  ...,
  expr = substitute(unquoted_expr),
  mask.ok = NULL
)

Arguments

unquoted_expr

The expression to be evaluated, This is automatically quoted.

name

The environment name. If an environment of that name already exists, it is reused, otherwise, a new environment is attached.

pos

The position where to attach the environment, if creating a new one. If an environment of name already exists, pos is ignored.

warn.conflicts

logical. If TRUE (the default), print warnings about objects in the attached environment that that are masking or masked by other objects of the same name.

...

Ignored.

expr

An R language object. This is an escape hatch from the automatic quoting of unquoted_expr.

mask.ok

character vector of names of objects that can mask objects on the search path without signaling a warning if warn.conflicts is TRUE.

Value

The result after evaluating expr, invisibly.

Examples

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attach_eval({
  my_helper_funct <- function(x, y) x + y
})

search() # environment "local:utils" is now attached
my_helper_funct(1, 1) # the local utility is now available

detach(local:utils) # cleanup

envir documentation built on Nov. 26, 2020, 9:06 a.m.