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ABENCONVERSION_STRUC - CONVERSION STRUC

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Conversion Rules for Structures

In assignments between structures, it is necessary to distinguish between flat structures and deep structures:

• Deep structures can only be assigned to each other if they are compatible. Full compatibility is not required for the following deep components, and the following applies instead:

• For components that have a reference type, upcasts but not downcasts are allowed.

• For table-like components, it is sufficient if the line type is compatible. This means that full compatibility is not required, which also includes table categories and table keys.

• For flat structures, there are conversion rules for the following assignments between incompatible data objects:

• Conversion between flat structures

• Conversion between flat structures and single fields

Notes

• If substring access is performed on a structure and the substring is shorter than the structure, the substring is handled like an operand of type c and the corresponding conversion rules apply. If the substring corresponds exactly to the length of the structure, the substring is handled like the structure itself.

• A lossless assignment can be used to apply the same assignment rule to flat structures as to deep structures.

• The conversion rules for structures are designed to prevent catchable exceptions from being raised. If an assignment is allowed, it takes place.

• The statement MOVE-CORRESPONDING or the conversion operator CORRESPONDING can be used to assign structures component by component.

Avoid unexpected conversion results

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