const auto compare = range_size_tree.key_comp();
auto rs_start = range_size_tree.lower_bound(range_t{0, size}, compare);
for (auto rs = rs_start; rs != range_size_tree.end(); ++rs) {
const auto compare = range_size_tree.key_comp();
auto rs_start = range_size_tree.lower_bound(range_t{0, size}, compare);
for (auto rs = rs_start; rs != range_size_tree.end(); ++rs) {