Method emplace_back

src/prevector.h:428–435

    template<typename... Args>
    void emplace_back(Args&&... args) {
        size_type new_size = size() + 1;
        if (capacity() < new_size) {
            change_capacity(new_size + (new_size >> 1));
        }
        new(item_ptr(size())) T(std::forward<Args>(args)...);
        _size++;
    }

    void push_back(const T& value) {
        emplace_back(value);