when i review the avro's code. I find:
..............
#define avro_record_get_field_value(rc, rec, typ, fname, ...) \
do { \
avro_datum_t field = NULL; \
(rc) = avro_record_get((rec), (fname), &field); \
if (rc) break; \
(rc) = avro_##typ##_get(field, __VA_ARGS__); \
} while (0)
.............
I think, if the typ == enum that like this:
(rc) = avro_##typ##_get(field, __VA_ARGS__); // avro_enum_get(field,);
To help solve this problem, CPP behaves specially for variable arguments used
with the token paste operator, `##'. If instead you write
(rc) = avro_##typ##_get(field, ##__VA_ARGS__);
and if the variable arguments are omitted or empty, the `##' operator causes
the preprocessor to remove the comma before it. I like avro! Come on! Keep it
up!
