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• any ABAP_GENERIC_TYPE • any table ABAP_GENERIC_TYPE • c ABAP_GENERIC_TYPE • clike ABAP_GENERIC_TYPE • csequence ABAP_GENERIC_TYPE • data ABAP_GENERIC_TYPE • decfloat ABAP_GENERIC_TYPE • hashed table ABAP_GENERIC_TYPE • index table ABAP_GENERIC_TYPE • n ABAP_GENERIC_TYPE • numeric ABAP_GENERIC_TYPE • object ABAP_GENERIC_TYPE • p ABAP_GENERIC_TYPE • simple ABAP_GENERIC_TYPE • sorted table ABAP_GENERIC_TYPE • standard table ABAP_GENERIC_TYPE • table ABAP_GENERIC_TYPE • x ABAP_GENERIC_TYPE • xsequence ABAP_GENERIC_TYPE
Generic ABAP Types The following table shows the built-in generic ABAP types. A generic data type is an incomplete type specification that covers multiple complete type specifications. Apart from 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 in procedure calls, the system checks whether its concrete data type is compatible with the object, that is, 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. TypeDescription ABAP_KEY anyAny data type ABAP_KEY any tableInternal table with any table type ABAP_KEY cText field with a generic length ABAP_KEY clikeCharacter-like (c, n, and string, as well as the date/time types d, t and character-like flat structures) ABAP_KEY csequenceText-like (c, string) ABAP_KEY dataAny data type ABAP_KEY decfloatDecimal floating point number type (decfloat16, decfloat34) ABAP_KEY hashed tableHashed table ABAP_KEY index tableIndex table ABAP_KEY nNumeric text with generic length ABAP_KEY numericNumeric ((b, s), i, int8, p, decfloat16, decfloat34, f) ABAP_KEY objectAny object type (root class of the inheritance hierarchy) ABAP_KEY pPacked number with generic length and generic number of decimal places ABAP_KEY simpleElementary data type including enumerated types and structured types with exclusively character-like flat components ABAP_KEY sorted tableSorted table ABAP_KEY standard tableStandard table ABAP_KEY tableStandard table ABAP_KEY xByte field with generic length ABAP_KEY xsequenceByte-like (x, xstring) A typing with the generic type data acts like a typing with the generic type any, with the following exception: No numeric functions, description functions, or arithmetic functions can be passed to a formal parameter typed with the type data. All other expressions, built-in functions, and functional methods are possible. In addition to the built-in generic types shown in the table above, ABAP currently includes exactly one kind of user-defined generic type. A table type defined with TYPES - TABLE OF or defined in the ABAP Dictionary is generic if the primary table key is not specified or specified incompletely or if the secondary table key of the table type is generic.
Latest 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 used. For example, if csequence is used, it must be ensured that the possible concrete types c and string behave differently with respect to trailing blanks, or that the concrete numeric types that are possible for numeric in calculations lead to different calculation types. Especially during generalization of existing types, it may be necessary to adapt the implementation accordingly.
Like all generic types listed here, except data and object , the generic type any can only be specified directly after TYPE. any cannot be specified after TYPE REF TO. The only generic types allowed here are data for fully generic data reference variables and object for fully generic object reference variables. Specifying REF TO any would define a fully generic reference variable that includes data references and object references, which is currently not 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, since it is not actually a real generic type but the empty abstract root class of all object classes of ABAP Objects. An object reference variable typed using REF TO object can point to any object because of the general property of reference variables where 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 also possible to classify object as a generic type.
In the case of the generic type p, note 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.
The elementary data type utclong is only included in the generic types simple, data, and any.
Regardless of their base type, enumerative types are only enclosed by the generic types any, data and simple. NON_V5_HINTS ABAP_HINT_END
ABAP_EXAMPLE_VX5 Use of 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. ABAP_EXAMPLE_END
