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Data References in ABAP Release 6.10 ITOC
ABAP_MODIFICATION_NN Typing Using TYPE DATA
TYPE DATA was previously handled like TYPE REF TO DATA and were therefore completely typed. Now TYPE DATA can only be used for formal parameters and field symbols; otherwise a syntax error occurs. A non-generic type can now be specified after REF TO.
ABAP_MODIFICATION_NN Specifying Types for CREATE
A type no longer needs to be specified for the statement CREATE DATA ... if the reference is completely typed. In this case, the new data object is given the type of the reference.
ABAP_MODIFICATION_NN Uppercase and Lowercase in Dynamically Specified Types
In the statement CREATE DATA ..., previously only uppercase letters could be used for the field content of dynamically specified types. In ABAP_RELEASE 6.10, lowercase letters can also be used. Initially the system searches using the specified field content; if this search fails, the system searches again using uppercase letters. If this search also fails, a runtime error occurs.
ABAP_MODIFICATION_NN Defining Typed Data References
In the case of the statements TYPES and DATA, a fixed type can now be specified for the addition REF TO.
ABAP_MODIFICATION_NN Casting Data References
The introduction of typed data references enables downcasts in assignments between data reference variables. Downcasts must be expressed using a special assignment operator, ?=.
ABAP_EXAMPLE_VX5 ABEXA 01154 ABAP_EXAMPLE_END
ABAP_MODIFICATION_NN Additional Type Information for ASSIGN dref->*
If a data reference has fixed typing, it passes on its additional attributes if it is assigned to an untyped data reference. DATA: dataobj TYPE dtel_1, dataref_1 TYPE REF TO dtel_2, dataref_2 TYPE REF TO data. FIELD-SYMBOLS <(><)> TYPE ANY.
GET REFERENCE OF dataobj TO dataref_1. dataref_2 = dataref_1. ASSIGN dataref_2->* TO <(><)>. In this case, dataref_1->*, dataref_2->*, and < F > inherit the attributes of the dictionary data element DTEL_2.
ABAP_MODIFICATION_NN Any Typing for CREATE DATA
New types, such as data references and internal tables, can be constructed when data objects are created using the statement CREATE DATA. Previously, only references to existing types were possible.
ABAP_MODIFICATION_NN Dereferencing in Any Operand Positions
If a data reference variable is completely typed, it can be dereferenced in any operand position, using the dereferencing operator ->*.
