The REAL type causes a #define statement to be generated in the header file of the form ASN1V_<valueName> where <valueName> would be replaced with the name in the ASN.1 source file. By generating #define statements, the symbolic names can be included in the source code making it easier to adjust the boundary values.

This mapping is defined as follows:

ASN.1 production:

   <name> REAL ::= <value>

Generated code:

   #define ASN1V_<name> <value>;

For example, the following declaration:

   rvalue REAL ::= 5.5

will cause the following statement to be added to the generated header file:

   #define ASN1V_rvalue 5.5

The reason the ASN1V_ prefix is added is to prevent collisions with other declarations such as enumeration items with the same name.