Welcome to the "STL Containers" section of the "STL Library" lesson!

As a senior engineer interested in networking and engineering in C++ as it pertains to finance, understanding the container classes in the STL library is essential. The STL provides various container classes that allow you to store and manipulate data efficiently.

One of the most commonly used container classes in the STL is the vector.

A vector in C++ is a dynamic array that can grow or shrink in size. It provides random access to its elements and allows efficient insertion and deletion at the end.

Here is an example of how to create and use a vector:

1#include <iostream>
2#include <vector>
3
4int main() {
5  std::vector<int> nums = {1, 2, 3, 4, 5};
6
7  std::cout << "Numbers: ";
8  for (int num : nums) {
9    std::cout << num << " ";
10  }
11
12  std::cout << std::endl;
13
14  return 0;
15}

In the above code, we create a vector nums and initialize it with some numbers. Then, we use a range-based for loop to iterate over the elements of the vector and print them.

Try running this code and observe the output.

By understanding the container classes provided by the STL library, you will be able to effectively store and manipulate data in your C++ programs.

Next, we will dive deeper into the various algorithms provided by the STL library to perform operations on these container classes.

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#include <iostream>

#include <vector>

​

int main() {

  std::vector<int> nums = {1, 2, 3, 4, 5};

​

  std::cout << "Numbers: ";

  for (int num : nums) {

    std::cout << num << " ";

  }

​

  std::cout << std::endl;

​

  return 0;

}