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Quadratic Constraint Attributes
These are quadratic constraint attributes, meaning that they are
associated with specific quadratic constraints in the model. You
should use one of the various get routines to retrieve the
value of an attribute. These are described at the beginning of
this section).
For the object-oriented interfaces, quadratic constraint attributes
are retrieved by invoking the get method on a constraint
object. For attributes that can be modified directly by the user, you
can use one of the various set methods.
Attempting to query an attribute that is not available will produce an
error. In C, the attribute query routine will return a
GRB_ERROR_DATA_NOT_AVAILABLE error code. The object-oriented
interfaces will throw an exception.
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