# 13520 - Dynamic Array
>author: Utin
###### tags: `class`
---

## Brief
See the code below

## Solution 0

#include <iostream>
#include "function.h"

Darray::~Darray() {
    delete[] data;
}

int& Darray::operator[](int idx) {
    return data[idx];
}

void Darray::pushback(int x) {
    if (size >= capacity) resize();
    data[size] = x;
    size++;
}

void Darray::clear(void) {
    delete[] data;
    data = new int[capacity];
    size = 0;
}

int Darray::length(void) {
    return size;
}

void Darray::resize(void) {
    capacity *= 2;
    int* tmp = new int[capacity];
    // copy data
    for (int i = 0; i < size; i++) 
        tmp[i] = data[i];
    // free memory
    delete[] data;
    data = tmp;
}

// Utin

## Reference