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ARTICLE • -> ABAP_SELECTOR
Object Component Selector A component comp> of an object is accessed using the name ref->comp> In this case, the character ->> is the object component selector. The name ref> of a reference variable must be to the left of the object component selector. The name ref> can itself be composite. The name comp> of the component must be to the right of the object component selector. If an attempt is made to access an object component with a reference variable that contains the null reference>, a non-handleable exception is raised. Dereferencing of a data reference in the statement ASSIGN> is an exception to this. The object component selector dereferences the reference variable ref> and makes the components of the referenced object accessible.
If ref> is an object reference variable, the components comp > of the object (attributes and methods) to which the object reference variable points are addressed using the object component selector.
If ref> is a data reference variable that is typed as a structure, the components comp> of the structure to which the data reference variable points are addressed using the object component selector.
Note If ref> is a data reference variable, the character *> can be specified after the object component selector ->>. This creates the general dereferencing operator ->*>. The expression ref->* > labels the entire data object to which the data reference variable points. The dereferencing operator is the only way to dereference data references. In the case of untyped data reference variables, this was only possible using the statement ASSIGN>. The dereferencing operator cannot be specified after object reference variables. The instance components of classes can only be accessed using the expression ref->comp >.
Example Access to the public attribute a1> of a class c1> by using the object reference variable oref>. CLASS c1 DEFINITION.> PUBLIC SECTION.> DATA a1 TYPE string READ-ONLY.> ENDCLASS.>
DATA oref TYPE REF TO c1.>
... oref->a1 ...>
Example The data reference variable dref> is typed as a structure and the component carrid> of the referenced structure is accessed using the object component selector. The expression dref->carrid > has the same meaning as the chaining dref->*-carrid>. DATA dref TYPE REF TO sflight.>