C++ - 更新指针中的值被覆盖

我最近开始学习C++，但在Movie类中更新指针时遇到了一些问题。我有一种感觉，我的移动/复制构造函数中某处遇到了问题，但几个小时以来一直在尝试解决这个问题，交换指向值引用的指针，最后来这里寻求帮助。

我有一个类Movie，其中包含字符串名称，字符串评级和int监视成员变量。另一类Movies，持有电影的向量。在电影中，我的方法increment_watched应该将观看的 int 增加 1，该值确实会增加，但似乎该值没有保存。Movies 中的display_all_movies方法仅显示它存储的电影，其中包含观看的旧值。我知道这个问题可能很小，但我无法弄清楚为什么没有保存该值。

如果有人可以解释为什么指针值似乎被覆盖了，我将不胜感激。提前感谢！

代码在下面，里面有一些调试程序。

电影.h

#ifndef _MOVIE_H_
#define _MOVIE_H_
#include <string>
#include <iostream>
class Movie {
private:
std::string *name;
std::string *rating;
int *watched;
public:
std::string get_name();
std::string get_rating();
int get_watched();
void increment_watched();
Movie(std::string name, std::string rating, int watched_val); // normal constructor
Movie(const Movie &source); // copy constructor
Movie(Movie &&source); // move constructor
~Movie();
};
#endif // _MOVIE_H_

电影.cpp

#include "Movie.h"
std::string Movie::get_name() {
return *name;
}
std::string Movie::get_rating() {
return *rating;
}
int Movie::get_watched() {
return *watched;
}
void Movie::increment_watched() {
std::cout << *watched << std::endl;
(*watched)++; // TODO FIX!
std::cout << *watched << std::endl;
}
Movie::Movie(std::string name, std::string rating, int watched_val) 
: name{nullptr}, rating{nullptr}, watched{nullptr}{   
std::cout << "Creating movie " << watched_val << " with normal constructor" << std::endl; 
this->name = new std::string{name};
this->rating = new std::string{rating};
this->watched = new int{watched_val};
}
Movie::Movie(const Movie &source) 
: Movie(*source.name, *source.rating, *source.watched) {
std::cout << "Creating movie " << *source.watched << " with copy constructor" << std::endl; 
}
Movie::Movie(Movie &&source)
: Movie(*source.name, *source.rating, *source.watched) {
std::cout << "Creating movie " << *source.watched << " with move constructor" << std::endl; 
source.name = nullptr;
source.rating = nullptr;
source.watched = nullptr;
}
Movie::~Movie() {
delete name;
delete rating;
delete watched;
}

电影.h

#ifndef _MOVIES_H_
#define _MOVIES_H_
#include <vector>
#include <string>
#include <iostream>
#include "Movie.h"
class Movies {
private:
static int count;
std::vector<Movie> *movies;
public:
void add_movie(std::string &&name, std::string &&rating, int &&watch);
void increment_movie_count(std::string &&name);
void display_all_movies();
void count_movies();
Movies();
Movies(const Movie &source); // copy constructor
Movies(Movie &&source); // move constructor
~Movies();
};
#endif // _MOVIES_H_

电影.cpp

#include "Movies.h"
int Movies::count = 0;
void Movies::add_movie(std::string &&name, std::string &&rating, int &&watch) {
bool contains {false};
for(auto movie : *movies) {
if(movie.get_name() == name) {
contains = true;
}
}
if(!contains) {
movies->push_back(Movie{name, rating, watch});
count++;
}
}
void Movies::increment_movie_count(std::string &&name) {
for(auto movie : *movies) {
if(movie.get_name() == name) {
movie.increment_watched();
}
}
}
void Movies::display_all_movies() {
for(auto movie : *movies) {
std::cout << "Title " << movie.get_name() << " Rating " << movie.get_rating() << " Watched " << movie.get_watched() << std::endl;
}
}
void Movies::count_movies() {
std::cout << "There are " << count << " movies " << std::endl; 
}
Movies::Movies() {
movies = new std::vector<Movie>{};
}
Movies::~Movies() {
delete movies;
}

最后是主要的.cpp

#include <iostream>
#include "Movies.h"
using std::cout;
using std::endl;
int main() {
Movies *my_movies;

my_movies = new Movies();
(*my_movies).count_movies();
my_movies->add_movie("Big", "PG-13", 2);
my_movies->increment_movie_count("Big");
my_movies->display_all_movies();
return 0;
}