What are some practical examples of C++20 concepts?

What are some practical examples of C++20 concepts?

C++20 introduces several concepts like 'integral', 'floating_point', and 'destructible'. For instance, 'integral' can be used to constrain template parameters to only integral types.

Can you show me a code snippet using the 'integral' concept?

Sure! Here's a simple example:

#include <concepts>
#include <iostream>

template <std::integral T>
void printIntegral(T value) {
    std::cout << "Value: " << value << std::endl;
}

int main() {
    printIntegral(42); // This works
    // printIntegral(3.14); // This would cause a compile-time error
}

This function only accepts integral types.

What about the 'floating_point' concept?

The 'floating_point' concept works similarly. Here's an example:

#include <concepts>
#include <iostream>

template <std::floating_point T>
void printFloat(T value) {
    std::cout << "Float Value: " << value << std::endl;
}

int main() {
    printFloat(3.14); // This works
    // printFloat(42); // This would cause a compile-time error
}

This function only accepts floating-point types.