void Options::OptionsSetUnion(const OptionSet &set_a, const OptionSet &set_b,
OptionSet &union_set) {
OptionSet::const_iterator pos;
OptionSet::iterator pos_union;
// Put all the elements of set_a into the union.
for (pos = set_a.begin(); pos != set_a.end(); ++pos)
union_set.insert(*pos);
// Put all the elements of set_b that are not already there into the union.
for (pos = set_b.begin(); pos != set_b.end(); ++pos) {
pos_union = union_set.find(*pos);
if (pos_union == union_set.end())
union_set.insert(*pos);
}
}
size_t Options::OptionsSetDiff(const OptionSet &set_a, const OptionSet &set_b,
OptionSet &diffs) {
size_t num_diffs = 0;
OptionSet::const_iterator pos_a;
OptionSet::const_iterator pos_b;
for (pos_a = set_a.begin(); pos_a != set_a.end(); ++pos_a) {
pos_b = set_b.find(*pos_a);
if (pos_b == set_b.end()) {
++num_diffs;
diffs.insert(*pos_a);
}
}
return num_diffs;
}