ABAP Keyword Documentation → ABAP − Reference → Data Interfaces and Communication Interfaces → ABAP and XML → Transformations for XML → ST - Simple Transformations → ST - Serialization and Deserialization → ST - Value Assignments
ST - tt:cast, Down Cast
The statement tt:cast can be used 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 called a down cast.
The statement tt:cast is a special case of the statement tt:assign, in which only reference variables can be declared as source fields and target fields. Reference variables can be declared as follows:
- A node node declared in accordance with the addressing rules and to which an ABAP reference variable is bound
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.