1 files changed, 85 insertions, 0 deletions
diff --git a/src/arrow/r/inst/include/cpp11/sexp.hpp b/src/arrow/r/inst/include/cpp11/sexp.hpp
new file mode 100644
index 000000000..0a5edccb4
--- /dev/null
+++ b/src/arrow/r/inst/include/cpp11/sexp.hpp
@@ -0,0 +1,85 @@
+// cpp11 version: 0.3.1.1
+// vendored on: 2021-08-11
+#pragma once
+
+#include <stddef.h>  // for size_t
+
+#include <string>  // for string, basic_string
+
+#include "cpp11/R.hpp"                // for SEXP, SEXPREC, REAL_ELT, R_NilV...
+#include "cpp11/attribute_proxy.hpp"  // for attribute_proxy
+#include "cpp11/protect.hpp"          // for preserved
+
+namespace cpp11 {
+
+/// Converting to SEXP
+class sexp {
+ private:
+  SEXP data_ = R_NilValue;
+  SEXP preserve_token_ = R_NilValue;
+
+ public:
+  sexp() = default;
+
+  sexp(SEXP data) : data_(data), preserve_token_(preserved.insert(data_)) {
+    // REprintf("created %x %x : %i\n", data_, preserve_token_, protect_head_size());
+  }
+
+  sexp(const sexp& rhs) {
+    data_ = rhs.data_;
+    preserve_token_ = preserved.insert(data_);
+    // REprintf("copied %x new protect %x : %i\n", rhs.data_, preserve_token_,
+    // protect_head_size());
+  }
+
+  sexp(sexp&& rhs) {
+    data_ = rhs.data_;
+    preserve_token_ = rhs.preserve_token_;
+
+    rhs.data_ = R_NilValue;
+    rhs.preserve_token_ = R_NilValue;
+
+    // REprintf("moved %x : %i\n", rhs.data_, protect_head_size());
+  }
+
+  sexp& operator=(const sexp& rhs) {
+    preserved.release(preserve_token_);
+
+    data_ = rhs.data_;
+    preserve_token_ = preserved.insert(data_);
+    // REprintf("assigned %x : %i\n", rhs.data_, protect_head_size());
+    return *this;
+  }
+
+  // void swap(sexp& rhs) {
+  // sexp tmp(rhs);
+  // rhs = *this;
+  //*this = tmp;
+  //}
+
+  ~sexp() { preserved.release(preserve_token_); }
+
+  attribute_proxy<sexp> attr(const char* name) const {
+    return attribute_proxy<sexp>(*this, name);
+  }
+
+  attribute_proxy<sexp> attr(const std::string& name) const {
+    return attribute_proxy<sexp>(*this, name.c_str());
+  }
+
+  attribute_proxy<sexp> attr(SEXP name) const {
+    return attribute_proxy<sexp>(*this, name);
+  }
+
+  attribute_proxy<sexp> names() const {
+    return attribute_proxy<sexp>(*this, R_NamesSymbol);
+  }
+
+  operator SEXP() const { return data_; }
+  operator double() const { return REAL_ELT(data_, 0); }
+  operator size_t() const { return REAL_ELT(data_, 0); }
+  operator bool() const { return LOGICAL_ELT(data_, 0); }
+  SEXP data() const { return data_; }
+};
+
+}  // namespace cpp11