void reserve(size_t new_capacity) {
if (new_capacity > capacity()) {
const size_t old_capacity = capacity();
m_mapping.resize(new_capacity);
std::fill(data() + old_capacity, data() + new_capacity, osmium::index::empty_value<value_type>());
}
}
void reserve(size_t new_capacity) {
if (new_capacity > capacity()) {
m_mapping.resize(new_capacity);
}
}
