inject_funs: Inject functions into the environment of 'evaluate()'

Description Usage Arguments Note Examples

Description

Create functions in the environment specified in the envir argument of evaluate(). This can be helpful if you want to substitute certain functions when evaluating the code. To make sure it does not wipe out existing functions in the environment, only functions that do not exist in the environment are injected.

Usage

1

Arguments

...

Named arguments of functions. If empty, previously injected functions will be emptied.

Note

For expert use only. Do not use it unless you clearly understand it.

Examples

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library(evaluate)
# normally you cannot capture the output of system
evaluate("system('R --version')")

# replace the system() function
inject_funs(system = function(...) cat(base::system(..., intern = TRUE), sep = "\n"))

evaluate("system('R --version')")

inject_funs()  # empty previously injected functions

evaluate documentation built on May 28, 2019, 5:06 p.m.