Function erase

examples/server/json.hpp:19042–19059

    }

    size_type erase(const key_type& key)
    {
        for (auto it = this->begin(); it != this->end(); ++it)
        {
            if (m_compare(it->first, key))
            {
                // Since we cannot move const Keys, re-construct them in place
                for (auto next = it; ++next != this->end(); ++it)
                {
                    it->~value_type(); // Destroy but keep allocation
                    new (&*it) value_type{std::move(*next)};
                }
                Container::pop_back();
                return 1;
            }
        }
        return 0;
    }

    template<class KeyType, detail::enable_if_t<
                 detail::is_usable_as_key_type<key_compare, key_type, KeyType>::value, int> = 0>