#include <algorithm>
#include <iostream>
#include <vector>
 
struct A {
   int val;
 
   bool operator<(const A& other) const {
      std::cout << "operator\n";
      return val < other.val;
   }
 
   A() = default;
   A(A&& a) : val(a.val) {
      std::cout << "move ctor\n";
   }
   A &operator=(A&& a) {
      val = a.val;
      std::cout << "move assign\n";
   }
};
 
void swap(A& a, A& b) {
   std::cout << "foo\n";
   std::swap(a.val, b.val);
}
 
int main()
{
   std::vector<A> a(2);
   a[0].val = 10;
   a[1].val = -1;
 
   std::sort(a.begin(), a.end());
}

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