Variable Attributes

These are variable attributes, meaning that they are associated with specific variables 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, variable attributes are retrieved by invoking the get method on a variable 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.