gd_native_type(3)						      GETDATA							 gd_native_type(3)

NAME

       gd_native_type -- returns the native data type of a field in a dirfile

SYNOPSIS

       #include <getdata.h>

       gd_type_t gd_native_type(DIRFILE *dirfile, const char *field_code);

DESCRIPTION

       The  gd_native_type() function queries a dirfile(5) database specified by dirfile and returns the native data type of the field field_code,
       which may contain a representation suffix.

       The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).

       The native data type of a field of a given entry type is calculated as:

       BIT or INDEX Entry:
	      GD_UINT64;

       CONST or CARRAY Entry:
	      the data type of the field;

       LINCOM or POLYNOM Entry:
	      if any of the scalar parameters is complex valued, or if the native data type of any of the input fields is complex valued:  GD_COM-
	      PLEX128, otherwise: GD_FLOAT64;

       LINTERP Entry:
	      if the look-up table is complex valued: GD_COMPLEX128, otherwise: GD_FLOAT64;

       MULTIPLY or DIVIDE Entry:
	      if either input field is complex valued: GD_COMPLEX128, otherwise: GD_FLOAT64;

       PHASE Entry:
	      the native data type of the input field;

       RAW Entry:
	      the data type of the raw data on disk;

       RECIP Entry:
	      if the dividend or the native data type of the input field is complex valued: GD_COMPLEX128, otherwise: GD_FLOAT64;

       SBIT Entry:
	      GD_INT64;

       STRING Entry:
	      GD_NULL.

       Furthermore,  if the supplied field_code contains a representation suffix, and the native data type of the field is complex valued, the na-
       tive type returned will be the corresponding real valued type.

RETURN VALUE

       Upon successful completion, gd_native_type() returns the native data type of the field code specified.  This will be one of the symbols:

	      GD_NULL, GD_UINT8, GD_INT8, GD_UINT16, GD_INT16, GD_UINT32, GD_INT32, GD_FLOAT32, GD_FLOAT64, GD_COMPLEX64, GD_COMPLEX128.

       The meanings of these symbols are explained in the gd_getdata(3) manual page.  On error, it returns GD_UNKNOWN and sets the  dirfile  error
       to a non-zero error value.  Possible error values are:

       GD_E_BAD_CODE
	       The field specified by field_code or one of the fields it uses as input was not found in the database.

       GD_E_BAD_DIRFILE
	       The supplied dirfile was invalid.

       GD_E_BAD_REPR
	       The representation suffix specified in field_code, or in one of its input fields, was not recognised.

       GD_E_BAD_SCALAR
	       A non-literal scalar used in the definition of the field or one of its inputs was not found, or was not a CONST or CARRAY field.

       GD_E_DIMENSION
	       A scalar field was found where a vector field was expected.

       GD_E_OPEN_LINFILE
	       An error occurred while trying to read a LINTERP table from disk.

       GD_E_RECURSE_LEVEL
	       Too  many levels of recursion were encountered while trying to resolve field_code.  This usually indicates a circular dependency in
	       field specification in the dirfile.

       The dirfile error may be retrieved by calling gd_error(3).  A descriptive error string for the last error encountered can be obtained  from
       a call to gd_error_string(3).

SEE ALSO

       dirfile(5), gd_open(3), gd_getdata(3), gd_error(3), gd_error_string(3)

Version 0.7.0							  3 November 2010						 gd_native_type(3)