Hello, for reasons I want to know the return value of TYPEOF(R_NilValue), I expect it to be NILSXP, but I can't find this documented anywhere. Ideally, I'd like to see the source definition of R_NilValue, but after fair bit of searching I cannot find an obviously location for this. Would someone please point me in the right direction? thanks -- CRICOS provider code 00123M
source definition for R_NilValue/return from TYPEOF(R_NilValue)
5 messages · Dan Kortschak, Gábor Csárdi, Ivan Krylov
It is in the source: https://github.com/wch/r-source/blob/ea8c13aef93058c71d647619583b561567856584/src/include/Rinternals.h#L110 https://github.com/wch/r-source/blob/ea8c13aef93058c71d647619583b561567856584/src/include/Rinternals.h#L1798 It could probably be in https://cran.r-project.org/doc/manuals/r-devel/R-lang.html#NULL-object Gabor On Mon, Dec 16, 2019 at 9:59 AM Dan Kortschak
<dan.kortschak at adelaide.edu.au> wrote:
Hello, for reasons I want to know the return value of TYPEOF(R_NilValue), I expect it to be NILSXP, but I can't find this documented anywhere. Ideally, I'd like to see the source definition of R_NilValue, but after fair bit of searching I cannot find an obviously location for this. Would someone please point me in the right direction? thanks -- CRICOS provider code 00123M
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
On Sun, 15 Dec 2019 10:47:11 +0000
Dan Kortschak <dan.kortschak at adelaide.edu.au> wrote:
I'd like to see the source definition of R_NilValue, but after fair bit of searching I cannot find an obviously location for this. Would someone please point me in the right direction?
As far as I understand, the assignment to R_NilValue happens in src/main/memory.c: https://github.com/wch/r-source/blob/776929704cb4f9398f52805f48f2c93582ec3d38/src/main/memory.c#L2186 (see the definition of GET_FREE_NODE(s) in the same file) Besides declaring R_NulValue as "extern" and assignments in void InitMemory(), there doesn't seem to be anything else.
Best regards, Ivan
Thank you, but those source lines do not address the issue here. Dan
On Mon, 2019-12-16 at 10:02 +0000, G?bor Cs?rdi wrote:
It is in the source:
https://github.com/wch/r-source/blob/ea8c13aef93058c71d647619583b561567856584/src/include/Rinternals.h#L110
https://github.com/wch/r-source/blob/ea8c13aef93058c71d647619583b561567856584/src/include/Rinternals.h#L1798
It could probably be in
https://cran.r-project.org/doc/manuals/r-devel/R-lang.html#NULL-object
Gabor On Mon, Dec 16, 2019 at 9:59 AM Dan Kortschak <dan.kortschak at adelaide.edu.au> wrote:
Hello, for reasons I want to know the return value of TYPEOF(R_NilValue), I expect it to be NILSXP, but I can't find this documented anywhere. Ideally, I'd like to see the source definition of R_NilValue, but after fair bit of searching I cannot find an obviously location for this. Would someone please point me in the right direction? thanks -- CRICOS provider code 00123M
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
-- CRICOS provider code 00123M
Thanks, Ivan. That answers the question perfectly. Dan
On Mon, 2019-12-16 at 13:33 +0300, Ivan Krylov wrote:
On Sun, 15 Dec 2019 10:47:11 +0000 Dan Kortschak <dan.kortschak at adelaide.edu.au> wrote:
I'd like to see the source definition of R_NilValue, but after fair bit of searching I cannot find an obviously location for this. Would someone please point me in the right direction?
As far as I understand, the assignment to R_NilValue happens in src/main/memory.c:
https://github.com/wch/r-source/blob/776929704cb4f9398f52805f48f2c93582ec3d38/src/main/memory.c#L2186
(see the definition of GET_FREE_NODE(s) in the same file) Besides declaring R_NulValue as "extern" and assignments in void InitMemory(), there doesn't seem to be anything else.
-- CRICOS provider code 00123M