iterator operator++(int)
        {
            iterator old(this->current, this->tree);
            if (this->current->rth)
                this->current = this->current->right;
            else
            {
                this->current = this->current->right;
                while (!this->current->lth)
                    this->current = this->current->left;
            }
            return old;
        }
        iterator operator--(int)
        {
            iterator old(this->current, this->tree);
            if (!this->current)
            {
                this->current = this->tree->root;
                while (!this->current->rth)
                    this->current = this->current->right;
            }
            else if (this->current->lth)
                this->current = this->current->left;
            else
            {
                this->current = this->current->left;
                while (!this->current->rth)
                    this->current = this->current->right;
            }
            return old;
        }
        iterator operator++()
        {
            if (this->current->rth)
                this->current = this->current->right;
            else
            {
                this->current = this->current->right;
                while (!this->current->lth)
                    this->current = this->current->left;
            }
            return *this;
        }
        iterator operator--()
        {
            if (!this->current)
            {
                this->current = this->tree->root;
                while (!this->current->rth)
                    this->current = this->current->right;
            }
            else if (this->current->lth)
                this->current = this->current->left;
            else
            {
                this->current = this->current->left;
                while (!this->current->rth)
                    this->current = this->current->right;
            }
            return *this;
        }