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Re: advice on extensions needed

From: Brook Milligan <brook(at)biology(dot)nmsu(dot)edu>
To: tgl(at)sss(dot)pgh(dot)pa(dot)us
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: advice on extensions needed
Date: 2000-08-25 18:19:30
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
   > - Is it possible to write functions to automatically convert one
   >   extended type into another?  If so, how should this be done?

   A function named the same as a type, with one argument of some other
   type, is treated as an implicit type conversion rule by the parser.

Just to make sure I understand.  Suppose I create two user-defined
types A and B and want interconversions.  I will need the following
functions, right?

	/* I/O */
A * A_in (const char *);
char * A_out (const A *);
B * B_in (const char *);
char * B_out (const B *);

	/* conversions */
A * A (const B *);
B * B (const A *);

Thanks again.


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