Using a vector and classes - c++

Question

I have a problem that for you might look simple but I can't figure it out even though I really tried.
#include <iostream>
#include <string>
#include <vector>
//Functions Prototypes ---
void create_object(std::vector <Movie> &);
std::string set_name();
int set_ryear();
double set_rating();
//Classes ---
class Movie {
public:
std::string name;
int release_year;
double rating;
public:
//Constructors
Movie(std::string u_name, int u_release_year, double u_rating);
~Movie() {};
Movie(const Movie &);
};
//MAIN ---
int main() {
std::vector <Movie> Collection;
create_object(Collection);
return 0;
}
//Constructors ---
Movie::Movie(std::string u_name, int u_release_year, double u_rating)
:name{ u_name }, release_year{ u_release_year }, rating{ u_rating }{
}
//Stand-Alone Functions ---
char get_selection() {
char x;
std::cin >> x;
return x;
}
void create_object(std::vector <Movie> &x) {
std::string u_name = set_name();
int u_ryear = set_ryear();
double u_rating = set_rating();
Movie User_Movie{ u_name,u_ryear,u_rating };
}
std::string set_name() {
std::string x;
std::cout << "Name: ";
std::cin >> x;
return x;
}
int set_ryear() {
int x;
std::cout << "Release year: ";
std::cin >> x;
return x;
}
double set_rating() {
double x;
std::cout << "Rating: ";
std::cin >> x;
return x;
}
I'm just a beginner, so I don't know much, but for as much as I know classes should be types even if they are user-defined types, and they are supposed to give the possibility to be manipulated as primitive types.
So why, when I try to create a vector that expects a bunch of Movie types, or when I pass it by reference, I receive errors?
Error C2664 'void create_object(std::vector &)': cannot convert argument 1 from 'std::vector<Movie,std::allocator<Movie>>' to 'std::vector &'
Error C2923 'std::vector': 'Movie' is not a valid template type argument for parameter '_Ty'
Error C2065 'Movie': undeclared identifier
The main usage for it should be to be visible to all functions so that I can pass it to them as I want, and to make operations on its objects (like after creating a new object, I want to be able to add it into the collection using push_back() and all that stuff) after I create a menu system using switch.

Answer 1

You have not declared the Movie class by the time you reach this statement:
void create_object(std::vector <Movie> &);
The correct way to do C++ classes is to put the basic declaration in a separate file movie.h and then #include it in your code at the start.
If you cannot do that (although you really should), move the class declaration to the start of the file.