C++20 Concepts

Constrain template arguments with expressive compile-time validation.

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Introduced in C++20, Concepts are named sets of requirements on template arguments that give clear, readable compiler error messages instead of dozens of lines of template errors.

Key Takeaways: C++20 Concepts

Mastering C++20 Concepts helps you write clean and reliable C++ code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

C++20 Concepts Code Example

C++

#include <iostream>
#include <concepts>

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

int main() {
    std::cout << "Integer sum: " << add(5, 10) << "\n";
    // add(5.5, 2.2); // Fails compile with clean concept error!
    return 0;
}

Output

Integer sum: 15

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

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C++ Virtual Functions and Polymorphism

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C++20 Concepts

💡 Key Takeaways: C++20 Concepts

C++20 Concepts Code Example

Key Takeaways: C++20 Concepts