What is the usage of STL in C++?

What is the usage of STL in C++?

STL, or Standard Template Library, is a powerful set of C++ template classes that provide general-purpose classes and functions. It includes algorithms, iterators, and containers like vectors, lists, and maps.

Can you explain what containers are in STL?

Containers are data structures that store objects and data. In STL, common containers include vectors, lists, sets, and maps, each serving different purposes and offering various functionalities.

How do I choose the right container for my needs?

Choosing the right container depends on your specific requirements, such as the need for fast access, insertion, or deletion. For example, use a vector for dynamic arrays, a list for frequent insertions/deletions, and a map for key-value pairs.

What are iterators in STL?

Iterators are objects that allow you to traverse through the elements of a container. They provide a way to access container elements without exposing the underlying structure.

Can you give an example of using a vector in C++?

Sure! Here's a simple example:

#include <iostream>
#include <vector>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};
    for(int num : numbers) {
        std::cout << num << " ";
    }
    return 0;
}

This code initializes a vector and prints its elements.