attach_eval: Evaluate R expressions in an attached environment.

In envir: Manage R Environments Better

Description

Evaluate R expressions in an attached environment.

Usage

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

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.