template <class T>
inline void my_vector<T>::reallocate() {
    T* tarray = reinterpret_cast<T*>(new int8_t[capacity_ * sizeof(T)]);
    for (size_t i = 0; i < size_; i++)
        new (&tarray[i]) T(array_[i]);
    delete[] reinterpret_cast<int8_t*>(array_);
    array_ = tarray;
}

template <class T>
void my_vector<T>::resize(size_t size) {
    reserve(size);
    for (size_t i = size; i < size_; i++)
        array_[i].~T();
    for (size_t i = size_; i < size; i++)
        new (&array_[i]) T();
    size_ = size;
}

template <class T>
void my_vector<T>::reserve(size_t capacity) {
    if (capacity > capacity_) {
        capacity_ = 1;
        while (capacity_ < capacity)
            capacity_ <<= 1;
        reallocate();
    }
}