I want to use functions from the expss package in my own functions/packages. I usually call the functions along with their packages (e.g. dplyr::mutate(...)).

The expss package has a function/operator %to%, and I don't know how I can do the same here, i.e. expss::%to% doesn't work, neither does expss::'%to%'.

What can I do?

CodePudding user response：

Infix operators must be attached to be usable; you can’t use them prefixed with the package name.¹

Inside a package, the conventional way is to add an importFrom directive to your NAMESPACE file or, if you’re using ‘roxygen2’, add the following Roxygen directive somewhere:

#' @importFrom expss %to%

Outside of package code, you could use ‘box’ to attach just the operator:

box::use(expss[`%to%`])

Or you can use simple assignment (this is the easiest solution in the simplest case but it becomes a lot of distracting code for multiple operators):

`%to%` = expss::`%to%`

¹ Except using regular function call syntax:

expss::`%to%`(…)