FullyOrdered c++11 class (assume that will work in msvc as well as gcc clang)

myclass.h

#ifndef MY_CLASS_H
#define MY_CLASS_H

#include <tuple>
#include <utility>

template <typename T, typename U>
struct MyClass {     
    T first;
    U second;

    // semiregular

    MyClass(const MyClass& other)
        : first(other.first),
          second(other.second)
    {}

    MyClass(MyClass&& other)
        : MyClass() {
       swap(*this, other);
    }

    MyClass()
        : first(),
          second()
    {}

    ~MyClass()
    {}

    MyClass& operator=(MyClass other) {
        swap(*this, other);
        return *this;
    }

    // regular
    friend
    bool operator==(const MyClass& lhs, const MyClass& rhs) {
        return std::tie(lhs.first, lhs.second)
                   == std::tie(rhs.first, rhs.second);
    }

    friend
    bool operator!=(const MyClass& lhs, const MyClass& rhs) {
        return !operator==(lhs, rhs);
    }

    // fully ordered
    friend
    bool operator<(const MyClass& lhs, const MyClass& rhs) {
        return std::tie(lhs.first, lhs.second)
                   < std::tie(rhs.first, rhs.second);
    }

    friend
    bool operator>(const MyClass& lhs, const MyClass& rhs) {
        return operator<(rhs, lhs);
    }

    friend
    bool operator<=(const MyClass& lhs, const MyClass& rhs) {
        return !operator>(lhs, rhs);
    }

    friend
    bool operator>=(const MyClass& lhs, const MyClass& rhs) {
        return !operator<(lhs, rhs);
    } 
};

// swap
void swap(MyClass& lhs, MyClass& rhs) /* noexcept */ {
    using std::swap;
    swap(lhs.first, rhs.first);
    swap(lhs.second, rhs.second);
}


#endif // MY_CLASS_H

Yes hash is important now and will be added. Good catch Niall. The linked presentation is very good. So here goes an hours study again :-) 👍

I am not sure, but perhaps best to keep swap as a friend of the class defined in the class ? I need to check but friend has altered in c++11 to be more of a route along ADL as opposed to a coupling mechanism. I prefer to have all the typical class members/features defined in place, I know Fraser prefers the opposite.

We would probably all prefer msvc played nice and we could just use = default = delete as well as ignore swap definitions like this at all as you say Niall.

In any case I think hash need to be a non member and specialisation of std::hash? is that right?