On Thu, Feb 22, 2018 at 08:00:45PM -0500, Demitri Muna wrote: > Ah, I wasn’t aware of implicit coercion. Yes, that solves the problem > perfectly, thanks. > > Out of curiosity, how does one read a numeric type from within a C > extension (i.e. get a number value out of the Datum type)? I ask as I > was unable to find an example and there are a few open questions on > Stack Overflow > (e.g. > https://stackoverflow.com/questions/12588554/postgres-c-function-passing-returning-numerics). >
PG_GETARG_NUMERIC(), no? When working on implementing your own data types or when hacking out functions which manipulate arguments of an existing datatype, looking at the input and output functions help a lot. In your case, numeric_in and numeric_out in src/backend/utils/adt/numeric.c is full of hints. -- Michael
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