c++ move constructor

#include <iostream>
#include <sstream>
#include <cassert>
#include <array>
#include <limits>
#include <set>
#include <unordered_map>
#include <functional>
#include <memory>
#include <ostream>
#include <string>
#include <vector>
#include <map>
#include <optional>
#include <chrono>
#include <mutex>
#include <thread>
#include <utility>
#include <typeinfo>
#include <queue>

using namespace std;

class Data
{
public:
  // Default constructor
  // Data()  = delete ;
  // {
  //   cout << "I am born: " << data << endl;
  // };

  // Other constructors
  Data(int value) : data(value)
  {
    cout << "I am born:" << data << endl;
  }

  // Delete move constructor and move assignment operator (C++11 and later)
  // Data(Data &&) = delete;
  Data(Data &&d) : data(d.data)
  {
    cout << "I am born:" << data << endl;
  }

  ~Data()
  {
    cout << "I am die:" << data << endl;
  }

  void printData()
  {
    std::cout << "Data: " << data << std::endl;
  }

  int getData()
  {
    return data;
  }

private:
  int data = 0;
};


int main()
{

  Data a{1};

  Data b = std::move(a);

  cout << "ok" << endl;

  return 0;
}

g++    vector3.cpp   -o  a -std=c++2a   ;./a