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usercode
2020 Sep 07
0
some questions about R internal SEXP types
...eed to use the Go
unsafe package directly for anything other than making their function
signatures valid.
Similarly, the parameter passed in to Go can be C NULL, R_NilValue or a
non-null value. It's a little more work in the case that C NULL needs
to be distinquished from R_NilValue:
```
func UserGoCode(p unsafe.Pointer) unsafe.Pointer {
if p == nil {
// We have a C Null.
// If this condition is omitted, v below will be
// R_NilValue when p is nil.
}
v := (*sexp.Value)(p).Value()
// We have v as a type that is one of the R TYPE values.
...
```
> IIUC the system you described, this m...