tuple<int, box, box> box::bisect_int_at(int const i) const {
assert(0 <= i && i < m_values.size());
assert(!m_values[i].is_empty());
assert(m_values[i].is_bisectable());
box b1(*this);
box b2(*this);
ibex::Interval const iv = ibex::integer(b1.m_values[i]);
double const lb = iv.lb();
double const ub = iv.ub();
double const mid = iv.mid();
double const mid_floor = floor(mid);
double const mid_ceil = ceil(mid);
if (!iv.is_bisectable()) {
DREAL_LOG_FATAL << "NOT BISECTABLE = " << iv;
}
pair<ibex::Interval, ibex::Interval> new_intervals = iv.bisect();
b1.m_values[i] = ibex::Interval(lb, mid_floor);
b2.m_values[i] = ibex::Interval(mid_ceil, ub);
b1.m_idx_last_branched = i;
b2.m_idx_last_branched = i;
DREAL_LOG_DEBUG << "box::bisect on " << (*m_vars)[i] << " : int = " << m_values[i]
<< " into " << b1.m_values[i] << " and " << b2.m_values[i];
return make_tuple(i, b1, b2);
}
Tube::Tube(const ibex::Interval &intv_t, unsigned int slices_number)
{
if((slices_number == 0) || (slices_number & (slices_number - 1))) // decrement and compare
cout << "Warning Tube::Tube(): slices number (" << slices_number << ") not a power of 2." << endl;
m_intv_t = intv_t;
m_intv_y = ibex::Interval::EMPTY_SET;
m_slices_number = slices_number;
if(slices_number == 1)
{
m_first_subtube = NULL;
m_second_subtube = NULL;
}
else
{
pair<ibex::Interval,ibex::Interval> bisection = intv_t.bisect(0.5);
m_first_subtube = new Tube(bisection.first, slices_number / 2);
m_second_subtube = new Tube(bisection.second, slices_number / 2);
}
update();
}