Concepts in C++20: Type Safety Made Simple

Concepts in C++20: Type Safety Made Simple

Concepts in C++20: Type Safety Made Simple

Are you still using enable_if and SFINAE hacks to constrain templates? Meet C++20 concepts — a cleaner, safer, and readable way to express intent.

💡 What is a Concept?

A concept is a compile-time predicate that checks template type requirements.

🔍 Example: Constraining to Integers

✅ C++20 Concepts

#include <concepts>

template<std::integral T>
T add(T a, T b) {
    return a + b;
}

🛠️ Pre-C++20 with enable_if

#include <type_traits>

template<typename T>
typename std::enable_if<std::is_integral<T>::value, T>::type
add(T a, T b) {
    return a + b;
}

Concepts make the intent clear and the code simpler.

📥 Bonus Download

📘 Download: C++20 Cheatsheet (PDF)

This one-page reference includes modern C++20 features like concepts, coroutines, ranges, consteval, and more — ideal for embedded and freelance developers.

📘 This C++20 cheatsheet was created by Bartlomiej Filipek of CppStories.com. Shared here with credit to the author. Explore more of his work and the extended reference cards at his Patreon.

🤝 Need freelance help? Hire me for C++/AI projects

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