C++ Reference: class LinearConstraintBuilder

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Allow to build a LinearConstraint while making sure there is no duplicate variables. Note that we do not simplify literal/variable that are currently fixed here.

Method
AddLiteralTerm	Return type: ABSL_MUST_USE_RESULT bool Arguments: Literal lit, IntegerValue coeff Add literal * coeff to the constaint. Returns false and do nothing if the given literal didn't have an integer view.
AddTerm	Return type: void Arguments: IntegerVariable var, IntegerValue coeff Adds var * coeff to the constraint.
Build	Return type: LinearConstraint Builds and return the corresponding constraint in a canonical form. All the IntegerVariable will be positive and appear in increasing index order. TODO(user): this doesn't invalidate the builder object, but if one wants to do a lot of dynamic editing to the constraint, then then underlying algorithm needs to be optimized of that.
LinearConstraintBuilder	Arguments: const Model* model, IntegerValue lb, IntegerValue ub We support "sticky" kMinIntegerValue for lb and kMaxIntegerValue for ub for one-sided constraints.