SAP NetWeaver AS ABAP Release 751, ©Copyright 2017 SAP AG. All rights reserved.  

ABAP - Keyword Documentation →  ABAP - Reference →  Predefined Types, Data Objects, Functions, and Constructors →  Predefined Data Types → 

Generic ABAP Types

The following table shows the built-in generic ABAP types. A generic data type is a type not specified in full that includes multiple fully specified types. With the exception of object, all generic types can be used after TYPE for the typing of field symbols and formal parameters. When a data object is assigned to generically typed field symbols using the statement ASSIGN, or when a data object is used as an actual parameter for generically typed formal parameters for procedure calls, the system checks whether the concrete data type is compatible with the object (in other words, whether the data type is a subset of the generic type).

The only generic types that can be used after TYPE REF TO are data, for the generic typing of data references, and object, for the generic typing of object references.

Type	Description
any	Any data type
any table	Internal table with any table category
c	Text field with a generic length
clike	Character-like (c, n, and string plus the date/time types d, t and character-like flat structures)
csequence	Text-like (c, string)
data	Any data type
decfloat	Decimal floating point number (decfloat16, decfloat34)
hashed table	Hashed table
index table	Index table
n	Numeric text with generic length
numeric	Numeric ((b, s), i, int8, p, decfloat16, decfloat34, f)
object	Any object type (root class of the inheritance hierarchy)
p	Packed number with generic length and generic number of decimal places
simple	Elementary data type including enumerated types and structured types with exclusively character-like flat components
sorted table	Sorted table
standard table	Standard table
table	Standard table
x	Byte field with generic length
xsequence	Byte-like (x, xstring)

Besides the built-in generic types shown in the table above, ABAP at present includes exactly one kind of self-defined generic type. A table type defined with TYPES - TABLE OF or defined in ABAP Dictionary is generic if the primary table key is not defined or is incompletely defined or if the secondary table key of the table type is generic.

Notes

• When generic types are used for the typing of field symbols and formal parameters, it must be ensured that the correct results are obtained regardless of the actual type being used. For example, if csequence is used, the potential fixed types c and string must display different behavior with respect to trailing blanks or the potential numeric types in calculations for numeric must produce different calculation types. More specifically, when existing typings are generalized, it may be necessary to modify the implementation accordingly.

• The generic type any can, like all generic types listed here except data and object, only be specified directly after TYPE and has exactly the same effect there as the generic type data. After TYPE REF TO, only data (for fully generic data reference variables) and object (for fully generic object reference variables) can be specified. Specifying REF TO any would define a fully generic reference variable covering data references and object references. This is not currently possible.

• The generic type object can only be specified after REF TO and not directly after TYPE.

• The object type object plays a special role, because strictly speaking it is the empty root class of all object classes of ABAP Objects and is not a genuine generic type. An object reference variable typed using REF TO object can point to any object because of the general reference variable property stating that reference variables with the static type of a superclass can point to objects in all related subclasses. When compared with a data reference variable typed using the real generic data type data, which can point to any data object, it is perfectly possible to classify object as a generic type.

• Note with generic type p that when passing functional methods or arithmetic expressions to this type of typed input parameters, the length is always set to 16. With generic types numeric, simple and data or any, this is only the case for arithmetic expressions.

• Regardless of their base type, enumerative types are only enclosed by the generic types any, data and simple.

Example

Uses the built-in generic type numeric to type the input parameters of a method. Parameters with any numeric data types can be passed to the method (but no other data types).

METHODS numeric_operation IMPORTING num1          TYPE numeric
                                    num2          TYPE numeric
                          RETURNING VALUE(result) TYPE decfloat34.