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danrega
2023-04-14 14:41:29 +02:00
parent 3fd765ccb7
commit e30db53953
7 changed files with 20 additions and 21 deletions
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16
06_Dynamic_Programming.md
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@@ -300,6 +300,8 @@ TYPES i_table TYPE STANDARD TABLE OF i WITH EMPTY KEY.
DATA(ref3) = NEW i_table( ( 1 ) ( 2 ) ( 3 ) ( 4 ) ( 5 ) ).
"CREATE DATA statements (older syntax)
"Unlike above, the older syntax is not commented out. CREATE DATA is used for dynamic
"type specification as shown further down.
DATA ref4 TYPE REF TO string.
DATA ref5 TYPE REF TO data.
@@ -326,7 +328,7 @@ Excursion: Static vs. dynamic type, upcasts and downcasts
- Downcast: If the static type of the target variable is **more specific** than the static type of the source variable, a check must be made at runtime before the assignment is done. If you indeed want to trigger such a downcast, you must do it explicitly in your code. You can do this, for example, using the
[constructor operator](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenconstructor_operator_glosry.htm "Glossary Entry")
[`CAST`](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenconstructor_expression_cast.htm). In older code, you might see
the operator [`?=`](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abapmove_cast.htm)).
the operator [`?=`](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abapmove_cast.htm).
- In contrast to a downcast, an upcast does not have to be done explicitly. However, you can - but need not - use the mentioned operators for upcasts, too.
@@ -362,8 +364,8 @@ DATA ref6 TYPE REF TO data.
ref6 = NEW i( 654 ).
ref5 = CAST #( ref6 ).
"Old casting operator
ref5 ?= ref6.
"Casting operator: Older syntax
"ref5 ?= ref6.
```
**Addressing data references**
@@ -403,7 +405,6 @@ DATA(calc) = 1 + ref_gen->*.
"Complete structure
DATA(struc) = ref_carr->*.
"When dereferencing a data reference variable that has a structured
"data type, you can use the component selector -> to address individual components
DATA(carrid) = ref_carr->carrid.
@@ -492,15 +493,12 @@ DATA: BEGIN OF struc,
"Some value assignment
struc2 = VALUE #( num = 1 ref = NEW #( 2 ) ).
struc = VALUE #( num = 1 ref = NEW #( 2 ) ).
"Internal table
DATA itab LIKE TABLE OF struc WITH EMPTY KEY.
"Some value assignment in the first table line
"assuming the table is filled and a line is available.
APPEND struc TO itab.
itab[ 1 ]-ref->* = 123.
```