Merge branch 'master' into bugfix/listof-hasattribute-get

Author: kevinushey

ChangeLog

@@ -5,6 +5,11 @@
 	* inst/tinytest/cpp/ListOf.cpp: Added tests
 	* inst/tinytest/test_listof.R: Idem
 
+2026-06-23  Jeroen Ooms  <jeroenooms@gmail.com>
+
+	* Add templated integer-index overload on platforms without
+	LONG_VECTOR_SUPPORT such as wasm32 (PR #1482)
+
 2026-06-18  Dirk Eddelbuettel  <edd@debian.org>
 
 	* vignettes/rmd/Rcpp.bib: Updated references

inst/include/Rcpp/vector/Vector.h

@@ -21,6 +21,7 @@
 #define Rcpp__vector__Vector_h
 
 #include <Rcpp/vector/Subsetter.h>
+#include <type_traits>
 
 namespace Rcpp{
 
@@ -337,6 +338,20 @@ class Vector :
 
     inline Proxy operator[]( R_xlen_t i ){ return cache.ref(i) ; }
     inline const_Proxy operator[]( R_xlen_t i ) const { return cache.ref(i) ; }
+#ifndef LONG_VECTOR_SUPPORT
+    // On platforms without long vector support (notably wasm32) R_xlen_t is
+    // int while ptrdiff_t is long, so subscripting with any wider integer
+    // type would otherwise be ambiguous with the built-in pointer subscript
+    // synthesised via the implicit Vector -> SEXP conversion. The template
+    // overloads below provide an exact-match member candidate for every
+    // integer index type other than R_xlen_t itself.
+    template <typename T>
+    inline typename std::enable_if<std::is_integral<T>::value && !std::is_same<T, R_xlen_t>::value, Proxy>::type
+    operator[]( T i ){ return cache.ref(static_cast<R_xlen_t>(i)) ; }
+    template <typename T>
+    inline typename std::enable_if<std::is_integral<T>::value && !std::is_same<T, R_xlen_t>::value, const_Proxy>::type
+    operator[]( T i ) const { return cache.ref(static_cast<R_xlen_t>(i)) ; }
+#endif
 
     inline Proxy operator()( const size_t& i) {
         return cache.ref( offset(i) ) ;