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 -- Álvaro Herrera http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers