Method emplace

Source/Utils/json.hpp:16423–16434

            : Container{ init, alloc } {}

        std::pair<iterator, bool> emplace(const key_type& key, T&& t)
        {
            for (auto it = this->begin(); it != this->end(); ++it)
            {
                if (it->first == key)
                {
                    return { it, false };
                }
            }
            Container::emplace_back(key, t);
            return { --this->end(), true };
        }

        T& operator[](const Key& key)
        {