RsBundle  Check-in [8d95c5134e]

            if changed && term == Step::Term { term = Step::Null }
            try!(self.update_problem(term));
            self.show_info(term);
            if term == Step::Term {
                break;
            }
        }
        Ok(())
    }

    /// Called to update the problem.
    ///
    /// Calling this function typically triggers the problem to
    /// separate new constraints depending on the current solution.
    fn update_problem(&mut self, term: Step) -> Result<()> {
        let state = UpdateState {minorants: &self.minorants, step: term};
        let updates = match self.problem.update(&state) {
            Ok(updates) => updates,
            Err(err) => return Err(Error::Update(Box::new(err))),
        };

        let mut newvars = Vec::with_capacity(updates.len());
        for u in updates {
            match u {
                Update::AddVariable{lower, upper} => {
                    newvars.push((lower, upper));
                },
            }
        }

        if !newvars.is_empty() {
            let mut problem = &mut self.problem;
            let minorants = &self.minorants;
            self.master.add_vars(&newvars, &mut move |fidx, minidx, vars| {
                problem.extend_subgradient(minorants[fidx][minidx].primal.as_ref().unwrap(), vars).unwrap()
            });
        }

        Ok(())
    }

    /// Called to update the problem.
    ///
    /// Calling this function typically triggers the problem to
    /// separate new constraints depending on the current solution.