The following code example is taken from the book
C++20 - The Complete Guide
by Nicolai M. Josuttis,
Leanpub, 2021
The code is licensed under a
Creative Commons Attribution 4.0 International License.
// raw code
#include <compare>
class Value {
private:
long id;
//...
public:
constexpr Value(long i) noexcept
: id{i} {
}
//...
// enable use of all equality and relational operators:
auto operator<=> (const Value& rhs) const = default;
};