How to create a dynamic array in c++

There are four ways to create dynamic arrays in C: using std::vector. Use new and delete. Use template metaprogramming. Use boost library.

How to create a dynamic array in C

Dynamic array, also known as variable array or vector, is a A data structure whose size can be changed at runtime. In C, you can create dynamic arrays using the following methods:

1. Use the built-in std::vector

<code class="cpp">#include <vector>

int main() {
  // 创建一个整型动态数组，初始大小为 0
  std::vector<int> numbers;

  // 向数组中添加元素
  numbers.push_back(1);
  numbers.push_back(2);
  numbers.push_back(3);

  // 输出动态数组中的元素
  for (int number : numbers) {
    std::cout << number << " ";
  }

  return 0;
}</code>

2. Use new and delete

<code class="cpp">int* numbers = new int[size];
// 操作动态数组

delete[] numbers;</code>

3. Use template metaprogramming

<code class="cpp">template <typename T, size_t Size>
struct Array {
  T data[Size];
};

int main() {
  // 创建一个大小为 3 的整型动态数组
  Array<int, 3> numbers;

  // 操作动态数组

  return 0;
}</code>

4. Use boost library

<code class="cpp">#include <boost/array.hpp>

int main() {
  // 创建一个大小为 3 的整型动态数组
  boost::array<int, 3> numbers;

  // 操作动态数组

  return 0;
}</code>

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