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ABAP Keyword Documentation →  ABAP - Reference →  Declarative statemnts →  Data Types and Data Objects →  Declaring Data Objects →  DATA 

DATA - BOXED

Short Reference

Other versions: 7.31 | 7.40 | 7.54

Syntax


DATA struc TYPE struc_type BOXED.

Effect

This statement defines a structured attribute of a class or an interface as a static box. It can only be located in the declaration section of a class or an interface and only at the highest level.

A structured data type must be specified for struc_type. This can be a local program structured type, a visible structured type of a class or a global interface, or a structure from the ABAP Dictionary, and can contain static boxes.

Static boxes support initial value sharing. The structure is not saved in the higher-level context itself. Instead, an internal reference that points to the actual structure is stored in place of the component. A static box is therefore a deep component.


Notes

  • A structure with a static box is a deep structure and the corresponding restrictions apply.
  • The BOXED addition defines the static box with reference to its context (structure or class). A data type that is declared by a direct TYPE or LIKE reference to a static box is assigned its data type but is not a static box.
  • When a static box is copied from one structure to another structure using the INCLUDE TYPE|STRUCTURE statement, its static box attribute is also copied.
  • The addition BOXED can also be used in the statement TYPES to declare a substructure of a nested structured data type.


Example

The following section shows the allowed usage of the addition BOXED with the statement [CLASS-]DATA. In a class, declares a static structure struc1 and a structured instance attribute struc2 as a static box.

CLASS c1 DEFINITION. 
  PUBLIC SECTION. 
    TYPES: BEGIN OF t_struc, 
             comp1 TYPE c LENGTH 100, 
             comp2 TYPE n LENGTH 100, 
           END OF t_struc. 
  PRIVATE SECTION. 
    CLASS-DATA struc1 TYPE t_struc BOXED. 
   DATA       struc2 TYPE t100    BOXED. 
ENDCLASS.