Standard Library and STL

Comprehensive articles on the C++ Standard Library, STL containers, algorithms, and iterators.

Standard Library and STL

Powerful data processing with STL containers, algorithms, and iterators. Learn structures like vector, map, unordered_map and the <algorithm> toolbox with hands-on examples.

Goal: Choose the right container and algorithm to write performant and clean C++ code.

TL;DR

Containers: std::vector, std::list, std::deque.
Associative: std::map, std::unordered_map, std::set.
Algorithms: std::sort, std::find, std::accumulate.
Iterators & range-based for, std::string_view.

Overview of the C++ Standard Library

31 August 2026 • Standard Library and STL

Learn the C++ Standard Library, including STL containers, algorithms, iterators, and essential components for modern C++ development.

C++ C++ STL

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Using std::vector in C++

31 August 2026 • Standard Library and STL

Learn how to use std::vector in C++ for dynamic arrays, efficient element management, and practical programming examples.

Arrays C++ C++ STL

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Sequential Data Structures with std::list and std::deque in C++

31 August 2026 • Standard Library and STL

Learn how to use std::list and std::deque in C++, including performance differences, use cases, and sequential data management.

C++ C++ STL

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In C++, choosing meaningful variable names makes the code easier to read and understand without needing extra comments.


// unclear
int x;
int y;

// clearer
int totalCount;
int maxRetries;

In C++, always initialize variables when you declare them. Uninitialized variables may contain unpredictable values and cause bugs.


int count = 0;      // initialized, safe

int total;              // not initialized, risky
total = 10;

In C++, using auto improves readability when the type is obvious or very long. It helps focus on what the code does instead of how the type is written.


std::map<int, std::string> users;

// long and noisy
std::map<int, std::string>::iterator it = users.begin();

// clearer
auto it = users.begin();

In C++, avoid writing using namespace std;. It can cause name conflicts and make code harder to understand in larger projects.


// avoid this
using namespace std;

cout << "Hello";

// preferred
std::cout << "Hello";

In C++, always check the result of std::find. If the element is not found, the iterator will be equal to container.end().


std::vector<int> numbers = {1, 2, 3};

auto it = std::find(numbers.begin(), numbers.end(), 5);

if (it != numbers.end())
{
    std::cout << "Found: " << *it << std::endl;
}
else
{
    std::cout << "Not found" << std::endl;
}