FR: find_root if exists without error

[ctbrown]

I know this is small and happy to provide this as PR, bur there are occasions when it would be nice to test for a root without getting the error that find_root() throws. It could be as simple as:

find_root_safe <- function(...) { 
        x <- NULL 
       try( x <- find_root(...), silent=TRUE )
      return(x)
 }

[krlmlr]

Thanks. I'm open to a PR that implements has_root(), but the try() approach doesn't look safe to me. How about converting find_root() to a function that returns a string with an optional error attribute, and then implementing find_root() and has_root() as very thin wrappers that call that function? Please also update root_criterion() to include a has_file() member function (constructed similarly to find_file()).

[krlmlr]

In most use cases, if there's no root an error is the right thing.

[github-actions]

This old thread has been automatically locked. If you think you have found something related to this, please open a new issue and link to this old issue if necessary.