[jira] [Created] (ARROW-15316) [R] Make a one-function pointer function

["Jonathan Keane (Jira)" <ji...@apache.org>]

Jonathan Keane created ARROW-15316:
--------------------------------------

             Summary: [R] Make a one-function pointer function
                 Key: ARROW-15316
                 URL: https://issues.apache.org/jira/browse/ARROW-15316
             Project: Apache Arrow
          Issue Type: Improvement
          Components: R
            Reporter: Jonathan Keane
            Assignee: Dragoș Moldovan-Grünfeld


In ARROW-15173 [PR|https://github.com/apache/arrow/pull/12062/files] we added backwards compatibly to pointers between R and Python where we use `external_pointer_addr_double()` with old python versions. We could take a number of the blocks like:

{code}
 if (pyarrow_version() >= pyarrow_version_pointers_changed) {
    x$`_export_to_c`(schema_ptr)
  } else {
    x$`_export_to_c`(external_pointer_addr_double(schema_ptr))
  }
{code}

to 

{code}
x$`_export_to_c`(backwards_compatible_pointer(schema_ptr))
{code}

with {{backwards_compatible_pointer}} including the if/else



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