smm : show me the members

Lightweigth single header C++20 library.

Offerings two simple functionalities,
to introspect public data stucture (aggregate),
without any need for annotation or change in user code.

---

smm::for_each_member

A function use to apply the same invocable,
on each data member.

    #include <iostream>
    #include "for_each.hpp"
    
    struct Point{ double x{}, y{}, z{}; };
    
    int main()
    {
        Point p {1, 2, 3};
        auto print = [](double m){ std:: cout << m << ' '; };
        smm::for_each_member(p, print);
    }
    // => output : "1 2 3 "

---

smm::for_all_members

A function use to apply an invocable once,
with all data members as argument.

    #include <iostream>
    #include "for_each.hpp"
    
    struct Point{ double x{}, y{}, z{}; };
    
    int main()
    {
        Point p {1, 2, 3};
        auto print = [](double m0, auto...ms)
        {
            std:: cout << m0;
            ((std:: cout << ' ' << ms), ...);
        };
        smm::for_all_members(p, print);
    }
    // => output : "1 2 3"