Fixed Record

The template

 HLAfixedRecord<
   HLAfixedField<INDEX1, DATATYPE1,
   HLAfixedField<INDEX2, DATATYPE2,
   ...
   > ... > TYPENAME;

defines an ordered sequence of DATATYPE entries.

The data can be accessed using the field<INDEX>() function. The INDEX is a logical identifier only. The data are stored in the declaration order.

For example:

 +-------------+------------------------------------+----------------+-----------+
 |             | Field                              |                |           |
 | Record name +---------+--------------+-----------+ Encoding       | Semantics |
 |             | Name    | Type         | Semantics |                |           |
 +-------------+---------+--------------+-----------+----------------+-----------+
 |             | FIELD_X | HLAfloat32LE |           |                |           |
 |             +---------+--------------+-----------+                |           |
 | Coordinates | FIELD_Y | HLAfloat32LE |           | HLAfixedRecord |           |
 |             +---------+--------------+-----------+                |           |
 |             | FIELD_Z | HLAfloat32LE |           |                |           |
 +-------------+---------+--------------+-----------+----------------+-----------+
 
 enum {
   FIELD_X = 0,
   FIELD_Y,
   FIELD_Z
 };
 typedef HLAfixedRecord<
   HLAfixedField<FIELD_X, HLAfloat32LE,
   HLAfixedField<FIELD_Y, HLAfloat32LE,
   HLAfixedField<FIELD_Z, HLAfloat32LE
   > > > > Coordinates;
 HLAdata<Coordinates> value;

 value->field<FIELD_X>() = 3.14;
 value->field<FIELD_Y>() = 6.28;
 value->field<FIELD_Z>() = 9.42;