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Checking Structures

The operator EXACT can only be used to convert structures to compatible structures. Full compatibility is not required for the following deep components, for which the specified requirements apply:

• For components that have a reference type, up casts but not down casts are permitted.

• For table-like components, it is sufficient if the row type is compatible. This means that the full compatibility needed for table categories and table keys is not required here.

Other versions: 7.31 | 7.40 | 7.54

Notes

• When the operator EXACT is used, the conversion rules for flat structures are the same as those for deep structures. It is not possible to make conversions between structures and elementary data objects.

• If the structured types are compatible, no further checks are made on the content. If the source structure contains invalid data, this data is assigned to a compatible return value, even when the addition EXACT is used.

Example

Unlike simple conversion, lossless assignment leads to a syntax error.

DATA:
  BEGIN OF struc,
    col1 TYPE d,
    col2 TYPE t,
  END OF struc.

DATA(result1) = CONV string( struc ).  "Possible

DATA(result2) = EXACT string( struc ). "Not possible