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External pointers and attributes #308

@krlmlr

Description

@krlmlr

Invoking the move constructor of external_pointer<> clears attributes on an external pointer object.

I would expect the third and fourth output to be identical to the second output. A possible fix is duckdb/duckdb@12f6f10 (this project uses a vendored version of cpp11).

library(cpp11)

cpp_source(
  code = '
  #include "cpp11/external_pointer.hpp"
  #include "cpp11/strings.hpp"

  template <class X>
  cpp11::external_pointer<int> test_int() {
    X a = 0;
    auto p = cpp11::external_pointer<X>(&a, false);
    Rf_PrintValue(p);
    Rf_setAttrib(p, R_ClassSymbol, cpp11::writable::strings({"foo"}));
    Rf_PrintValue(p);

    return std::move(p);
  }

  [[cpp11::register]]
  SEXP test() {
    auto p = cpp11::sexp(test_int<int>());
    Rf_PrintValue(p);
    return p;
  }
  '
)

out <- test()
#> <pointer: 0x16f0af42c>
#> <pointer: 0x16f0af42c>
#> attr(,"class")
#> [1] "foo"
#> <pointer: 0x16f0af42c>
out
#> <pointer: 0x16f0af42c>

Created on 2023-03-02 with reprex v2.0.2

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