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danrega
2024-12-11 16:13:50 +01:00
parent 35789367b6
commit 8c42134f33
9 changed files with 342 additions and 75 deletions
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04_ABAP_Object_Orientation.md
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@@ -561,7 +561,7 @@ In the simplest form, methods can have no parameter at all. Apart from that, met
- If passing by reference is used, a local data object is not created for the actual parameter. Instead, the procedure is given a [reference](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenreference_glosry.htm "Glossary Entry") to the actual parameter during the call and works with the actual parameter itself.
- Note that parameters that are input and passed by reference cannot be modified in the procedure. However, the use of a reference is beneficial regarding the performance compared to creating a local data object.
The following example shows a class with a simple method demonstrating the syntax for formal paremeter specifications. Complete types are used.
The following example shows a class with a simple method demonstrating the syntax for formal parameter specifications. Complete types are used.
```abap
CLASS zcl_some_class DEFINITION
@@ -589,6 +589,8 @@ CLASS zcl_some_class IMPLEMENTATION.
METHOD if_oo_adt_classrun~main.
"The values 1, hello, and 2 are actual parameters supplied when
"the method is called.
DATA(result) = meth( i_a = 1
i_b = `hello`
i_c = 2 ).
@@ -598,11 +600,11 @@ CLASS zcl_some_class IMPLEMENTATION.
METHOD meth.
... "Method implementation
"No change for input parameters passed by reference
"Input parameters passed by reference cannot be changed in the method implementation.
"i_a += 1.
"i_b &&= ` world`.
"Input parameters passed by reference can be changed in the method.
"Input parameters passed by value can be changed in the method implementation.
i_c += 1.
ENDMETHOD.
@@ -669,7 +671,9 @@ CLASS zcl_some_class DEFINITION
"---- Local types ----
i_o TYPE c3 "elementary type
i_p TYPE der_type "table type (BDEF derived type)
"---- Note: Examaples for not allowed types of formal parameters ----
"---- Note: Examples such as the following are not allowed type specifications of formal parameters. ----
"---- In the following cases, extra (local) type declarations with TYPES are required before the --------
"---- method declaration to type the formal parameters. -------------------------------------------------
"i_no1 TYPE c LENGTH 3
"i_no2 TYPE TABLE OF zdemo_abap_fli WITH EMPTY KEY
"---- Reference types ----
@@ -682,14 +686,14 @@ CLASS zcl_some_class DEFINITION
i_v TYPE LINE OF zcl_demo_abap_amdp=>carr_fli_tab
i_w TYPE LINE OF der_type
"---- LIKE addition (types based on existing data objects) ----
i_x LIKE int "Local type
i_x LIKE int "Local data object
i_y LIKE zcl_demo_abap_dtype_dobj=>comma "Constant specified in a class
i_z LIKE zdemo_abap_objects_interface=>stat_str "Data object specified in an interface
"---- LIKE LINE OF addition (types based on existing internal tables) ----
i_1 LIKE LINE OF itab "Local type
i_1 LIKE LINE OF itab "Local internal table
"---- LIKE REF TO addition (reference types based on existing data object) ----
i_2 LIKE REF TO int "Local type (elementary)
i_3 LIKE REF TO itab "Local type (table)
i_2 LIKE REF TO int "Local elementary data object
i_3 LIKE REF TO itab "Local internal table
.
PROTECTED SECTION.
@@ -740,15 +744,15 @@ CLASS zcl_some_class DEFINITION
"---- Character-like types ----
i_c TYPE c "Text field with a generic length
i_clike TYPE clike "Character-like (c n string d t and character-like flat structures)
i_csequence TYPE csequence "Text-like (c string)
i_clike TYPE clike "Character-like (c, n, string, d, t, and character-like flat structures)
i_csequence TYPE csequence "Text-like (c, string)
i_n TYPE n "Numeric text with generic length
i_x TYPE x "Byte field with generic length
i_xsequence TYPE xsequence "Byte-like (x xstring)
i_xsequence TYPE xsequence "Byte-like (x, xstring)
"---- Numeric types ----
i_decfloat TYPE decfloat "decfloat16 decfloat34
i_numeric TYPE numeric "Numeric ((b s) i int8 p decfloat16 decfloat34 f)
i_numeric TYPE numeric "Numeric (i, int8, p, decfloat16, decfloat34, f, (b, s))
i_p TYPE p "Packed number (generic length and number of decimal places)
"---- Internal table types ----
@@ -904,7 +908,7 @@ CLASS zcl_some_class IMPLEMENTATION.
"--- sorted table: Allowed ---
i_sorted_table = s-tab_so
"--- index table: Not allowed ---
"--- sorted table: Not allowed ---
"i_sorted_table = s-tab_std
"i_sorted_table = s-tab_ha