isonum_t — Type for ISO numeric code values this library will accept.
// In header: </home/castedo/src/isomon/currency_data.h> typedef int16_t isonum_t;
Values returned by functions hash2isonum and code2isonum should be the only soures for valid ISO numeric values for this type. is_isonum(int i) will return true for valid values of this type.