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

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

C++20 introduces concepts to specify template requirements. For example, you can use std::integral to constrain a template to integral types.

Can you show me a code snippet using std::integral?

Sure! Here's a simple example:

#include <concepts>
#include <iostream>

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

int main() {
    printValue(42); // Works
    // printValue(3.14); // Error: double is not an integral type
}

This function only accepts integral types.

What are the benefits of using concepts in C++?

Concepts improve code readability and error messages by providing clear constraints on template parameters, making it easier to understand what types are acceptable.

Are there any other examples of concepts in C++20?

Yes! Another example is std::floating_point, which can be used to constrain templates to floating-point types. This helps ensure that your functions only accept the intended types.