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Use r altrep class getters #596

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Merged
jennybc merged 1 commit into from
Jan 9, 2026
Merged

Use r altrep class getters #596

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4 changes: 2 additions & 2 deletions src/altrep.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -134,8 +134,8 @@ bool vroom_altrep(SEXP x) {

if (ALTREP(x)) {

auto csym = CAR(ATTRIB(ALTREP_CLASS(x)));
auto psym = CADR(ATTRIB(ALTREP_CLASS(x)));
auto csym = R_altrep_class_name(x);
auto psym = R_altrep_class_package(x);
bool is_altrep = ALTREP(x);
bool materialzied = R_altrep_data2(x) != R_NilValue;

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14 changes: 14 additions & 0 deletions src/altrep.h
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@@ -1,3 +1,5 @@
#pragma once
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@jennybc jennybc Jan 7, 2026

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This should have really been here before, but it becomes absolutely necessary now that we've got some inline function definitions here.


#include <cpp11/R.hpp>

#include <R_ext/Rdynload.h>
Expand All @@ -10,3 +12,15 @@ extern "C" {
#if R_VERSION < R_Version(4, 6, 0)
#define DATAPTR_RW(x) DATAPTR(x)
#endif

// Backport ALTREP class accessors for R < 4.6.0
// These were introduced in R-devel:
// https://github.com/wch/r-source/commit/37eb29515a83672b53743cba11e88167ca063d06
#if R_VERSION < R_Version(4, 6, 0)
inline SEXP R_altrep_class_name(SEXP x) {
return ALTREP(x) ? CAR(ATTRIB(ALTREP_CLASS(x))) : R_NilValue;
}
inline SEXP R_altrep_class_package(SEXP x) {
return ALTREP(x) ? CADR(ATTRIB(ALTREP_CLASS(x))) : R_NilValue;
}
#endif