isNativeNull: Test whether an external pointer has the C-level NULL value
In omegahat/RAutoGenRunTime: Run-time support for automated interfaces to R

isNativeNull

R Documentation

Test whether an external pointer has the C-level NULL value

Description

This function allows us to determine from R whether the contents of an external pointer are NULL. See also isNilPointer. (Basically a repeat of this taken from another package.)

Usage

isNativeNull(x, andNULL = TRUE)

Arguments

`x`	the external pointer object to be tested
`andNULL`	if `x` is `NULL` in R and `andNULL` is `TRUE`, the function returns `TRUE` immediately. So this is only to handle the case where `x` is the R `NULL` value.