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Re: Change copyObject() to use typeof_unqual

Peter Eisentraut <peter@eisentraut.org>

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From: Peter Eisentraut <peter@eisentraut.org>
To: Jelte Fennema-Nio <postgres@jeltef.nl>
Cc: Daniel Gustafsson <daniel@yesql.se>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2026-03-14T13:03:05Z
Lists: pgsql-hackers 
On 13.03.26 17:18, Jelte Fennema-Nio wrote:
> On Fri, 13 Mar 2026 at 17:15, Jelte Fennema-Nio <postgres@jeltef.nl> wrote:
>> Attached should fix it.
> 
> Okay corrected in this v2, which fixes all of the places I could find.

This doesn't appear to work in this example program:

```
#include <type_traits>

#define mytypeof(x) std::remove_reference<decltype(x)>::value

void foo(void)
{
     int a;
     mytypeof(a) b;
}
```

Based on some internet search, it appears that ::type would work.  But 
it also appears to work without either one.

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add some const qualifiers enabled by typeof_unqual change on copyObject

  2. Hardcode typeof_unqual to __typeof_unqual__ for clang

  3. Clean up postgres_fdw/t/010_subscription.pl.

  4. Hardcode override of typeof_unqual for clang-for-bitcode

  5. Make typeof and typeof_unqual fallback definitions work on C++11

  6. Change copyObject() to use typeof_unqual

  7. Fixes for C++ typeof implementation

  8. Support using copyObject in standard C++