Add a new general constraint of type GRB.GENCONSTR_ABS to a model.

An ABS constraint $r = \mbox{abs}\{x\}$ states that the resultant variable $r$ should be equal to the absolute value of the argument variable $x$.

GRBGenConstr addGenConstrAbs ( GRBVar resvar,
    GRBVar argvar,
    String name )

    resvar: The resultant variable of the new constraint.

    argvar: The argument variable of the new constraint.

    name: Name for the new general constraint.

    Return value:

    New general constraint.