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From: Tom Lane <[email protected]>
To: Marthin Laubscher <[email protected]>
Cc: [email protected]
Subject: Re: Custom type's modifiers
Date: Thu, 27 Jun 2024 11:06:27 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Marthin Laubscher <[email protected]> writes:
> But now I need to (re)define MyType to support type modifiers (e.g. MyType(1,14,18)) and I got that done using CREATE TYPE’s TYPMOD_IN and TYPMOD_OUT parameters resulting in the correct packed value getting stored in pg_attribute when I define a column of that type. 

OK ...

> But when I pass a MyType value to a function defined in my C extension how would I access the type modifier value for the argument which could have been drawn from the catalog or the result of a cast. 

You can't.  Whatever info is needed by operations on the type had
better be embedded in the value.

			regards, tom lane

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