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I would like to create a function 

 CREATE FUNCTION func(a INT, b DOUBLE PRECISION = 1e-9, c DOUBLE PRECISION = 1e-9)
     RETURNS BOOLEAN
    AS 'MODULE_PATHNAME'
    LANGUAGE C IMMUTABLE STRICT;

How can one determine which arguments were actually passed to the C api?

Can one just use a check like

PG_GETARG_DATUM(1) != NULL

to check if the argument 1 was passed? I am writing the code for postgres >= 9.1

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  • there are functions PG_ARGISNULL(n), PG_NARGS() Commented Mar 20, 2015 at 11:58
  • In your example b and c will always be actually passed, either with default or explicit values. PG_NARGS is only useful if several Postgres functions share the same C code Commented Mar 20, 2015 at 12:21
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