About Us Products Articles News Contact Support

Programming Distributed Systems with YAMI4

10.2.3 Record Types

Record types are used to define the content structure of message payloads and reflect the structure of the regular YAMI4 parameters object.

Types can contain fields of the following standard types, which mirror regular YAMI4 types:

• Boolean and Boolean_Array,
• Integer and Integer_Array,
• Long_Long and Long_Long_Array,
• Float and Float_Array,
• String and String_Array,
• Binary Binary_Array

In addition, fields can have types that are user-defined, which allows to created nested data types.

Example type definitions:

   type Point is
      X : Integer;
      Y : Integer;
   end Point;
   
   type Line is
      A : Point;  --  nested user-defined type
      B : Point;
   end Line;

Fields can be declared as optional, which means that they might or might not be physically present in the data packet:

   type Point is
      First_Name : String;
      Last_Name : String;
      Address : optional String;  --  could be omitted
   end Point;