ABAPDATA_BOXED - DATA BOXED

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DATA - BOXED

Short Reference

Syntax

DATA struc TYPE struc_type BOXED.

Effect

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

A structured data type must be specified for struc_type. This can be a local program structuredtype, 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 adeep 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 INCLUDETYPE|STRUCTURE statement, its static box attribute is also copied.
  
  
• The BOXED addition can also be used in the TYPESstatement to declare a substructure of a nested structured data type.
  
  
  

Example

The following section outlines the permitted use of the BOXED addition with the [CLASS-]DATAstatement. In a class, a static structure struc1 and a structured instance attribute struc21 are declared 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.

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