Re: Custom type's modifiers

Marthin Laubscher <postgres(at)lobeshare(dot)co(dot)za> 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