Re: Is float8 a reference type?

Paul A Jungwirth <pj@xxxxxxxxxxxxxxxxxxxxxxxx> · Sat, 23 Sep 2017 10:09:08 -0700

On Sat, Sep 23, 2017 at 9:40 AM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
> I wonder whether you're using up-to-date Postgres headers (ones
> where Float8GetDatum is a static inline function).

I'm building against 9.6.3 on both machines. I'm not doing anything
special to change the compilation options. Here is my whole Makefile:

    MODULES = floatfile
    EXTENSION = floatfile
    EXTENSION_VERSION = 1.0.0
    DATA = floatfile--$(EXTENSION_VERSION).sql

    PG_CONFIG = pg_config
    PGXS := $(shell $(PG_CONFIG) --pgxs)
    include $(PGXS)

But what I'm really interested in is this: What are the bad things
that can happen if I do `datums = (Datum *)floats`, as long as it's
only when Datums are 8 bytes wide? Is there a platform with
pass-by-val float8s where that won't work?

Thanks,
Paul

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