Parameter Mapping to C Data Types

The primitive types that can be used as parameters to external functions are a restricted subset of the JADE primitive types. External functions do not support mapping to Decimal, Date, Time, TimeStamp, TimeStampInterval, or TimeStampOffset primitive types.

The external function mapping of standard C types to simple JADE primitive types is listed in the following table.

C Data Type	Recommended JADE Primitive Type
int	Integer
int64	Integer64
void*	MemoryAddress
long	Integer
short	Integer
char (ANSI)	Character
wchar_t (Unicode)	Character
bool	Boolean
float	Real[4]
double	Real or Real[8]

The external function mapping of standard C types to structured JADE primitive types is listed in the following table.

C Data Type	Recommended JADE Primitive Type
char* containing null-terminated string	String
char* containing binary data	Binary

You can substitute other JADE primitive types to clarify the interface. For example, you can map a JADE Boolean primitive type to any of int, long, short, char, or unsigned char C data types, and so on.

The handling and interpretation of signed or unsigned values is left to the external function protocol and your use of the function.