move-ctor.cpp

#include <string>
#include <utility>
#include <iostream>

class A {
  int member{};
 public: 
 ~A() {}; // User defined destructor;
};

class B {
  int member{};
public:
   B(const B &obj) {} // User defined copy constructor
};

class C {
  int member{};

};

int main() {
  std::cout << "A: " << std::is_trivially_move_constructible<A>::value << std::endl; 
  // A: 0 since A has an user-defined destructor.
  std::cout << "B: " << std::is_trivially_move_constructible<B>::value << std::endl; 
  // B: 0 since B has an user-defined copy-constructor.
  std::cout << "C: " << std::is_trivially_move_constructible<C>::value << std::endl; 
  // C: 1 all the rules for generating an implicit move are satisfied.
}