Bruce Momjian escribió:
> On Sun, Feb 23, 2014 at 07:50:08AM +0330, Mohsen SM wrote:
> > Hello.
> > I have a new type similar to varchar.
> > I want to fine how did I can to calculate typemod
> > and where must I calculate typemod for this type.
>
> Well, typmods are type-specific, so there is no official way to
> calculate it. I would look at how an existing type uses typmod and copy
> that.
Our system is pretty neat. See a complex example here:
https://github.com/postgis/postgis/blob/svn-trunk/postgis/gserialized_typmod.c
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Álvaro Herrera http://www.2ndQuadrant.com/
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