ARTICLE
rel_exp - Comparing Reference Variables
It is possible to compare data references to data references, and object
references to object references, but not data references to object
references. Two reference variables are identical if they point to the
same object. A comparison of size is defined internally and always
delivers the same results in similar situations.
Note
For data references to be identical it is not enough for the operands to
contain the same reference. Instead, the data type of the objects
references must be compatible . If, for
example, two reference variables have the same memory address, and one
points to a structure, the other to the first component of the
structure, then these variables are not identical since the data type of
the operands is incompatible. Reference variables filled using
GET REFERENCE might not be identical,
even though they point to the same data object, if GET REFERENCE
or the reference operator REF is executed for a field symbol to
which the data object was assigned using
casting .
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