Thank you for the report. We will look at this and make sure it gets fixed.
~G
On Thu, Nov 15, 2018, 3:13 PM Michael Sannella via R-devel <
r-devel@r-project.org> wrote:
> If I have loaded the C code:
> SEXP altrep_STRING_IS_SORTED(SEXP x)
> {
> return ScalarInteger(STRING_IS_SORTED(x));
> }
> and defined the function:
> issort <- function(x) .Call("altrep_STRING_IS_SORTED",x)
>
> I am seeing the following results in R 3.5.1/Linux:
> > issort(LETTERS)
> [1] NA
> > issort(as.character(1:100)) ## should return NA
> [1] 1
> > issort(as.character(100:1)) ## should return NA
> [1] -1
> > issort(as.character(1:100+1L))
> [1] NA
>
> issort(as.character(1:100)) should return NA, since the string vector
> "1","2",..."10",... is not sorted. I suspect that the problem is that
> the Is_sorted method for deferred_string is just calling the Is_sorted
> method for the source object 1:100 (which _is_ a sorted integer
> vector). It should probably just return NA for any source object.
>
> ~~ Michael Sannella
>
> [[alternative HTML version deleted]]
>
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