Method assign

src/prevector.h:176–183

public:
    void assign(size_type n, const T& val) {
        clear();
        if (capacity() < n) {
            change_capacity(n);
        }
        _size += n;
        fill(item_ptr(0), n, val);
    }

    template <std::input_iterator InputIterator>
    void assign(InputIterator first, InputIterator last) {