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#include <cstddef>
#include <iostream> #include <fstream> #include <sstream> #include <map> #include <memory> #include <string> class Movie { public: Movie(const std::string title) : title(title) { } const std::string& get_title() const { return title; } private: std::string title; }; class Actor { public: Actor(const std::string& name_) : name(name_) { } const std::string& get_name() const { return name; } void add_movie(std::shared_ptr<Movie> movie) { movies[movie->get_title()] = movie; } std::shared_ptr<Movie> lookup(const std::string& title) { auto it = movies.find(title); if (it == movies.end()) { return nullptr; } return it->second; } private: std::string name; std::map<std::string, std::shared_ptr<Movie>> movies; }; class Database { public: bool read_database(const std::string& infile) { unsigned int count_movies = 0; unsigned int count_actors = 0; unsigned int count = 0; std::ifstream in(infile); if (!in) return false; std::string line; while (getline(in, line)) { std::istringstream is(line); std::string title; if (getline(is, title, '~')) { std::shared_ptr<Movie> movie_curr(new Movie(title)); ++count_movies; movie[title] = movie_curr; std::string name; while (getline(is, name, '~')) { std::shared_ptr<Actor> actor_curr = lookup_actor(name); if (!actor_curr) { ++count_actors; actor_curr = std::shared_ptr<Actor>(new Actor(name)); actor[name] = actor_curr; } actor_curr->add_movie(movie_curr); } } if (++count % 100 == 0) { std::cout << count_movies << "/" << count_actors << "\r"; } } std::cout << actor.size() << " actors and " << movie.size() << " movies loaded." << std::endl; return true; } std::shared_ptr<Actor> lookup_actor(const std::string& name) const { auto it = actor.find(name); if (it == actor.end()) { return nullptr; } return it->second; } std::shared_ptr<Movie> lookup_movie(const std::string& title) const { auto it = movie.find(title); if (it == movie.end()) { return nullptr; } return it->second; } unsigned int number_of_actors() const { return actor.size(); } unsigned int number_of_movies() const { return movie.size(); } private: std::map<std::string, std::shared_ptr<Actor>> actor; std::map<std::string, std::shared_ptr<Movie>> movie; }; //--- Game using above data structures ----------------------------------------- #include <set> using namespace std; bool read_name(const std::string& prompt, std::set<std::string>& already_named, std::string& name) { string s; for(;;) { std::cout << prompt; if (!getline(cin, s)) return false; auto it = already_named.find(s); if (it == already_named.end()) { already_named.insert(s); name = s; return true; } std::cout << s << " was already named." << std::endl; } } std::shared_ptr<Actor> read_actor(const Database& db) { static std::set<std::string> named_actors; std::string name; for(;;) { if (!read_name("Actor: ", named_actors, name)) { return nullptr; } std::shared_ptr<Actor> actor = db.lookup_actor(name); if (actor) { return actor; } std::cout << name << " is not known." << std::endl; } } std::shared_ptr<Movie> read_movie(const Database& db) { std::string name; static set<string> named_movies; for(;;) { if (!read_name("Movie: ", named_movies, name)) { return nullptr; } std::shared_ptr<Movie> movie = db.lookup_movie(name); if (movie) { return movie; } std::cout << name << " is not known." << std::endl; } } bool associated(std::shared_ptr<Actor> actor, std::shared_ptr<Movie> movie) { if (actor == nullptr || movie == nullptr) { return true; } if (actor->lookup(movie->get_title())) { return true; } std::cout << "Sorry, but " << actor->get_name() << " did not participate in '" << movie->get_title() << "'" << std::endl; return false; } int main(int argc, char** argv) { if (argc != 2) { std::cerr << "Usage: " << argv[0] << " movies" << endl; return 1; } Database db; if (!db.read_database(argv[1])) { std::cerr << "Unable to open " << argv[1] << " for reading" << std::endl; return 1; } std::cout << "*** Actors/Movies Game ***" << std::endl; std::string name, title; std::shared_ptr<Actor> actor = nullptr; std::shared_ptr<Movie> movie = nullptr; unsigned int count = 0; for(;;) { actor = read_actor(db); if (!actor) { break; } if (!associated(actor, movie)) { break; } movie = read_movie(db); if (!movie) { break; } if (!associated(actor, movie)) { break; } ++count; } if (count > 1) { cout << "Well done, you have scored " << count << " points!" << endl; } else if (count == 1) { cout << "That was not very impressive!" << endl; } else { cout << "Disappointing!" << endl; } } |