SAP NetWeaver AS ABAP Release 740, ©Copyright 2014 SAP AG. All rights reserved.
ABAP Keyword Documentation → ABAP − Reference → Data Interfaces and Communication Interfaces → ABAP and XML → Transformations for XML → Simple Transformations → ST - Serialization and Deserialization → ST - Value Assignments →ST - tt:cast, Down Cast
Syntax
<tt:cast [to-ref="node"|to-var="variable"]
[ref="node"|var="variable"] />
Effect
You can use the tt:cast statement to assign the content of one reference variable to another reference variable, if the static type of the source variable is more general than the static type of the target variable. This is known as downcasting.
The tt:cast statement is a special case of the tt:assign statement, in which you can declare only reference variables as source fields and target fields. You can declare reference variables as follows:
If downcasting is not successful (if the static type of the target variable is less general than the dynamic type of the source variable when the statement runs), the ST program terminates with exception CX_ST_RUNTIME_ERROR.