void remove(const TId id, const TValue value) {
std::pair<iterator, iterator> r = get_all(id);
for (iterator it = r.first; it != r.second; ++it) {
if (it->second == value) {
m_elements.erase(it);
return;
}
}
}
typename std::enable_if<Enabler::value, void>::type do_remove(iterator it)
{
collection_.erase(it);
}
