Class A

04-Ranges & Algorithms/examples/03-split.cpp:6–19

#include <vector>

struct A
{
    int a;
    auto operator<=>(const A &another) const
    {
        std::print("Hello?");
        return a <=> another.a;
    }
    auto operator==(const A &another) const
    {
        std::print("Hello2?");
        return a == another.a;
    }
};

int main()
{