How do I use in constexpr contexts std::any in C++?

Learn how to use std::any in constexpr contexts in C++, providing examples and insights into type-safe container usage.

std::any, constexpr, C++, type-safe, container, modern C++


        #include <any>
        #include <iostream>

        // A constexpr function that returns a std::any
        constexpr std::any make_any() {
            return std::any(42);  // Example of storing an int
        }

        int main() {
            constexpr auto my_any = make_any();
            if (my_any.type() == typeid(int)) {
                std::cout << "Stored value is of type int: " << std::any_cast<int>(my_any) << std::endl;
            } else {
                std::cout << "Stored value is not an int." << std::endl;
            }
            return 0;
        }