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ABAPCALL_METHOD_PARAMETERS - CALL METHOD PARAMETERS

ABAPCALL_METHOD_PARAMETERS - CALL METHOD PARAMETERS

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meth( ... ), Parameter Passing

Short Reference



... $[EXPORTING  p1 = a1 p2 = a2 ...$]
    $[IMPORTING  p1 = a1 p2 = a2 ...$]
    $[CHANGING   p1 = a1 p2 = a2 ...$]
    $[RECEIVING  r  = a  $]
    $[EXCEPTIONS $[exc1 = n1 exc2 = n2 ...$]
                $[OTHERS = n_others$] $].

Additions

1. ... EXPORTING p1 = a1 p2 = a2 ...

2. ... IMPORTING p1 = a1 p2 = a2 ...

3. ... CHANGING p1 = a1 p2 = a2 ...

4. ... RECEIVING r = a

5. ... EXCEPTIONS exc1 = n1 exc2 = n2 ... $[OTHERS = n_others$]

Effect

Apart from the addition EXCEPTIONS, these additions assign actual parameters a1 a2... to the formal parameters p1 p2 ... or r of the parameter interface of the called method. Any data objects (and some expressions) can be specified as actual parameters if their data type matches the typing of the corresponding formal parameter in accordance with the rules of the typing check.

With the exception of the return value r for functional methods and the specification of arithmetic expressions for input parameters, every formal parameter inherits all properties of the assigned actual parameters when called. Non-class-based exceptions can be handled using the addition EXCEPTIONS. The order of the additions is fixed.

Notes

  • The formal parameters and non-class-based exceptions of a method are defined as its parameter interface using the additions of the statements METHODS or CLASS-METHODS of global or local classes.
  • Unlike function module calls, static parameter passing is checked by the syntax check and not just by the extended program check.

Addition 1

... EXPORTING p1 = a1 p2 = a2 ...

Effect

This addition assigns actual parameters to the input parameters of the called method. EXPORTING can be used to assign actual parameters to the optional input parameters and it must be used to assign actual parameters to the non-optional input parameters. In pass by reference, a reference to an actual parameter is passed when the call is made. In pass by value, the content of an actual parameter is assigned to the relevant formal parameter.

a1, a2, ... are general expression positions, which means that, in addition to data objects, functions and expressions can also be passed as actual parameters. Special rules apply in this case.

Notes

  • No substring access is possible after an actual parameter of type string or xstring specified after EXPORTING.
  • The addition EXPORTING can also be omitted in the short form of the static method call.

Example

Calls of a method with passing of actual parameters to input parameters. The first call is the syntax short form of the second call. Both have the same functionality.

Addition 2

... IMPORTING p1 = a1 p2 = a2 ...

Effect

This addition assigns actual parameters to the output parameters of the called method. IMPORTING can be used to assign actual parameters to all output parameters, but this is not mandatory. In pass by reference, a reference is passed to an actual parameter when the call is made. In pass by value, the content of an output parameter is assigned to the relevant actual parameter only if the method is completed without errors.

The actual parameters are result positions, which means that variables and writable expressions can be specified. Special rules apply in this case.

  • Existing variables or writable expressions can be specified as actual parameters for functional method calls. Inline declarations, however, cannot be specified.
  • Inline declarations DATA(var) or FINAL(var) can also be specified for standalone method calls. If an inline declaration is specified and a formal parameter is completely typed, this type is used for the declaration. If the formal parameter is typed generically, the following data types are used:
  • string for csequence and clike

  • xstring for xsequence

  • decfloat34 for numeric and decfloat

  • p with the length 8 and no decimal places if p is generic

  • The standard key for a standard table type with a generic primary table key

Other generic data types cannot be specified correctly for inline declarations and produce a syntax error.

Notes

  • If a formal parameter is typed with the generic type c or x, for example, string or xstring cannot be used as the type for an inline declaration, since the typing cannot be checked.
  • Functional method calls are on the right side of assignments or are part of expressions where no inline declarations are possible.

Example

The method GET_DOCU of the class CL_ABAP_DOCU_ITF has two input parameters and two output parameters, as well as a return value that indicates whether the method was executed successfully. Functionally, the method is called as an operand of a comparison expression in a logical expression. The values in the output are reused in further method calls only if the method completed successfully.

Addition 3

... CHANGING p1 = a1 p2 = a2 ...

Effect

This addition assigns actual parameters to the input/output parameters of the called method. CHANGING can be used to assign actual parameters to the optional input/output parameters and it must be used to assign actual parameters to the non-optional input/output parameters. In pass by reference, a reference to an actual parameter is passed when the call is made. In pass by value, the content of an actual parameter is assigned to the relevant formal parameter. In pass by value, the modified content of an input/output parameter is assigned to the relevant actual parameter only if the method is completed without errors.

The actual parameters are result positions, which means that variables and writable expressions can be specified. Special rules apply in this case.

Example

Call of a method with an input/output parameter.

Addition 4

... RECEIVING r = a

Effect

This addition assigns an actual parameter to the return value of the called method. It is only possible for standalone method calls and not for functional method calls. An actual parameter can be assigned to the return value of a functional method using RECEIVING. The data type of the actual parameter does not have to follow the general rules of the typing check and it is sufficient if the return value can be converted to the actual parameter in accordance with the conversion rules.

If the method is completed without errors, the content of the formal parameter is assigned to the actual parameter. The content is converted if necessary. If an exception is raised here, it cannot be handled and a runtime error always occurs instead.

The actual parameter is a result position, which means that variables and writable expressions can be specified. Special rules apply in this case.

An existing variable or expression or an inline declaration DATA(var) or FINAL(var) can be specified as an actual parameter. An inline declaration is made as soon as the data type of the return value is fully known.

Note

The addition RECEIVING is not usually used for static method calls. A functional method with a return value is not usually called as a standalone method call but as a functional method call in operand positions instead.

Example

Calls of a functional method with return value. The first call is the usual functional method call. The second call demonstrates the unusual use of the addition RECEIVING. The result is the same in both cases.

Addition 5

... EXCEPTIONS exc1 = n1 exc2 = n2 ... $[OTHERS =n_others$]

Effect

This addition is only possible for standalone method calls and not for functional method calls. The specified exceptions must exist in the parameter interface of the method.

Notes

  • If the value 0 is assigned to an exception, this indicates that the caller wants to ignore this exception. If the exception is raised in the method, no runtime error occurs, but the exception cannot be handled.

Example

Handling of non-class-based exceptions in a method call.






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