pitrou commented on a change in pull request #11919:
URL: https://github.com/apache/arrow/pull/11919#discussion_r766018570
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File path: r/src/py-to-r.cpp
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@@ -21,6 +21,41 @@
#include <arrow/c/bridge.h>
+// [[arrow::export]]
+double external_pointer_addr_double(SEXP external_pointer) {
+ // potentially lossy conversion to double needed for the current
+ // implementation of import/export to Python
+ return reinterpret_cast<uintptr_t>(R_ExternalPtrAddr(external_pointer));
+}
+
+// [[arrow::export]]
+std::string external_pointer_addr_character(SEXP external_pointer) {
+ void* ptr_void = R_ExternalPtrAddr(external_pointer);
+ uint64_t ptr_int64 = reinterpret_cast<uintptr_t>(ptr_void);
+ char ptr_chars[128];
+ memset(ptr_chars, 0, 128);
+ int nchar = sprintf(ptr_chars, "%llu", ptr_int64);
Review comment:
You can use `std::to_string`:
https://en.cppreference.com/w/cpp/string/basic_string/to_string
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