MoveSemanticsExercise created by victorbarbu - https://repl.it/@victorbarbu/MoveSemanticsExercise

data.h

#pragma once

#include <iostream>
#include <cstring>
#include <string>

#ifndef debug
#define debug false
#endif

#define print_debug(msg) \
  if (debug) { \
    std::cout << "debug: " << msg << std::endl; \
  }

class Data {
public:
  Data(): size{0}, data{nullptr} {
    print_debug("default constructor called");
  }

  Data(const char *str) {
    print_debug("c-string constructor called");

    size = std::strlen(str) + 1;
    data = new char[size];
    std::memcpy(data, str, size);
  }

  Data(const Data &other) {
    print_debug("copy constructor called");

    size = strlen(other.data) + 1;
    data = new char[size];
    memcpy(data, other.data, size);
  }

  Data(Data&& other): Data() {
    print_debug("move constructor called");

    swap(*this, other);
  }

  ~Data() {
    print_debug("destructor called");

    delete[] data;
  }

  friend void swap(Data& first, Data &second) {
    print_debug("custom swap function called");

    using std::swap;

    swap(first.data, second.data);
  }

  Data& operator=(Data other) {
    swap(*this, other);
    return *this;
  }

  int size;
  char *data;
};

main.cpp

#include <iostream>

#define debug true

#include "data.h"

using namespace std;

Data foo() {
  return Data{"moved?"};
}

int main() {
  auto a1 = foo();
  auto b1 = a1;
  auto b2{foo()};

  return 0;
}