Modern C++ Memory Management: std::unique_ptr, std::shared_ptr & RAII

By Elena Rostova • Advanced • 13 min read • Updated 2026-09-11

What You Will Master in This Tutorial

Understand unique ownership with std::unique_ptr and zero-cost abstraction.

1. The Power of std::unique_ptr and Move Semantics

std::unique_ptr automatically deallocates memory when it goes out of scope.

CPP

#include <iostream>
#include <memory>

void runWorker() {
    auto conn = std::make_unique<int>(42);
    // Destructor called automatically when out of scope
}

Note: Always prefer std::make_unique over new.

Knowledge Check: Test Your Understanding

1. What is the runtime performance overhead of std::unique_ptr compared to a raw pointer?

Frequently Asked Questions

When should I use std::shared_ptr instead of std::unique_ptr?

Only when an asset truly requires multiple owners across different lifetimes or asynchronous threads.