GRBQConstr#

class GRBQConstr#

Gurobi quadratic constraint object. Quadratic constraints are always associated with a particular model. You create a quadratic constraint object by adding a constraint to a model (using GRBModel::addQConstr), rather than by using a GRBQConstr constructor.

The methods on quadratic constraint objects are used to get and set quadratic constraint attributes. For example, quadratic constraint right-hand sides can be queried by calling get (GRB_DoubleAttr_QCRHS). Note, however, that it is generally more efficient to query attributes for a set of constraints at once. This is done using the attribute query method on the GRBModel object (GRBModel::get).

The full list of attributes can be found in the Attributes section of this document. Examples of how to query and set attributes can also be found in this section.

char get(GRB_CharAttr attr)#

Query the value of a char-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

double get(GRB_DoubleAttr attr)#

Query the value of a double-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

int get(GRB_IntAttr attr)#

Query the value of an int-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

string get(GRB_StringAttr attr)#

Query the value of a string-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

void set(GRB_CharAttr attr, char newvalue)#

Set the value of a char-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.

void set(GRB_DoubleAttr attr, double newvalue)#

Set the value of a double-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.

void set(GRB_IntAttr attr, int newvalue)#

Set the value of an int-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.

void set(GRB_StringAttr attr, const string &newvalue)#

Set the value of a string-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.