implement a class that supports all of the basic features of a login server using some premade data structures from the C++ STL: unordered_set and unordered_map

Create a new C++ source file named loginserver.cpp that implements the class declared in loginserver.h, so that loginserver.cpp and the provided files compile into a program that runs with no failed tests.

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//(loginserver.h)

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#ifndef LOGINSERVER_H #define LOGINSERVER_H #include  #include  #include  using namespace std; class LoginServer { public: // Creates a new server with no accounts. LoginServer(); // Adds a user to the system with the // parameter username and password. // Returns false if the LoginServer already has an // account with the parameter username. Otherwise returns true. bool create_user(string username, string password); // Deletes a user from the system with the specified info. // Returns true if the parameter information was valid // (and the user was successfully deleted). // Otherwise returns false. bool delete_user(string username, string password); // Returns the total number of accounts in the system. int total_user_count(); // Tries to log in a user. // Returns true if there is a user with this password // that is not already logged in (i.e. whether login occurred). // Otherwise returns false. bool login(string username, string password); // Tries to log out a user. // Returns true if a user with this user name was logged in. // Otherwise returns false. bool logout(string username); // Returns true if a user with this name is logged in. // Otherwise returns false. bool is_logged_in(string username); // Returns the number of logged-in users. int active_user_count(); // Logs out all users. void logout_everyone(); // Changes a user's password. // Returns true if there is an account with the parameter // username and password old_pw (i.e. the password changed). // Otherwise returns false. bool change_password(string username, string old_pw, string new_pw); private: // Stores the usernames of logged-in users unordered_set S; // Stores the mapping from usernames to passwords. unordered_map M; }; #endif 

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//(main.cpp)

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#include  #include  #include  #include "loginserver.h" using namespace std; inline void _test(const char* expression, const char* file, int line) { cerr << "test(" << expression << ") failed in file " << file; cerr << ", line " << line << "." << endl; abort(); } #define test(EXPRESSION) ((EXPRESSION) ? (void)0 : _test(#EXPRESSION, __FILE__, __LINE__)) int main() { LoginServer ls; // Test total_user_count(), create_user() test(ls.create_user("Ernesto", "p455w0rd")); test(ls.total_user_count() == 1); test(ls.create_user("Ruby", "QwErTy123")); test(ls.total_user_count() == 2); test(ls.create_user("Hugo", "1l0v3c4t5")); test(ls.total_user_count() == 3); test(ls.create_user("Margo", "Din0s4ur5!")); test(ls.total_user_count() == 4); test(ls.create_user("Berta", "!sc00p0f00d!")); test(ls.total_user_count() == 5); test(!ls.create_user("Berta", "anotherp455")); test(ls.total_user_count() == 5); test(ls.delete_user("Berta", "!sc00p0f00d!")); test(ls.total_user_count() == 4); test(!ls.delete_user("Ernesto", "wrongpassword")); test(ls.total_user_count() == 4); test(!ls.delete_user("Ernesto", "Din0s4ur5!")); test(ls.total_user_count() == 4); test(!ls.delete_user("Berta", "!sc00p0f00d!")); test(ls.total_user_count() == 4); test(ls.create_user("Berta", "!sc00p0f00d!")); test(ls.total_user_count() == 5); // Test login(), logout(), is_logged_in() test(!ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(!ls.is_logged_in("Unknown")); test(ls.login("Ernesto", "p455w0rd")); test(ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(ls.logout("Ernesto")); test(!ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(ls.login("Ruby", "QwErTy123")); test(ls.login("Hugo", "1l0v3c4t5")); test(!ls.is_logged_in("Ernesto")); test(ls.is_logged_in("Ruby")); test(ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(ls.logout("Ruby")); test(ls.logout("Hugo")); test(!ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(ls.login("Ruby", "QwErTy123")); test(ls.login("Berta", "!sc00p0f00d!")); test(!ls.is_logged_in("Ernesto")); test(ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(ls.is_logged_in("Berta")); // Test logging in with wrong password test(!ls.login("Margo", "idontknow")); test(!ls.is_logged_in("Ernesto")); test(ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(ls.is_logged_in("Berta")); // Test logging in when already logged in test(!ls.login("Ruby", "QwErTy123")); test(!ls.is_logged_in("Ernesto")); test(ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(ls.is_logged_in("Berta")); // Test logging in a user that doesn't exist test(!ls.login("Stranger", "Question!")); test(!ls.is_logged_in("Ernesto")); test(ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(ls.is_logged_in("Berta")); // Test logging out someone not logged in test(!ls.logout("Hugo")); test(!ls.is_logged_in("Ernesto")); test(ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(ls.is_logged_in("Berta")); // Test logging out a user that doesn't exist test(!ls.logout("Stranger")); test(!ls.is_logged_in("Ernesto")); test(ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(ls.is_logged_in("Berta")); test(ls.logout("Ruby")); test(ls.logout("Berta")); test(!ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); // Test active_user_count() test(ls.active_user_count() == 0); ls.login("Ernesto", "p455w0rd"); test(ls.active_user_count() == 1); ls.login("Ruby", "QwErTy123"); test(ls.active_user_count() == 2); ls.login("Berta", "!sc00p0f00d!"); test(ls.active_user_count() == 3); ls.login("Berta", "!sc00p0f00d!"); // Already logged in test(ls.active_user_count() == 3); ls.login("Berta", "!3x3rc1s3!"); // Wrong password test(ls.active_user_count() == 3); ls.login("Stranger", "_Secret_"); // Not a user test(ls.active_user_count() == 3); ls.logout("Berto"); // Not a user test(ls.active_user_count() == 3); ls.logout("Margo"); // Not logged in test(ls.active_user_count() == 3); ls.logout("Berta"); test(ls.active_user_count() == 2); ls.logout("Ernesto"); test(ls.active_user_count() == 1); ls.logout("Ruby"); test(ls.active_user_count() == 0); ls.logout("Berta"); // Not logged in test(ls.active_user_count() == 0); // Test logout_everyone() ls.login("Ernesto", "p455w0rd"); ls.login("Ruby", "QwErTy123"); ls.login("Hugo", "1l0v3c4t5"); ls.login("Margo", "Din0s4ur5!"); ls.login("Berta", "!sc00p0f00d!"); ls.logout_everyone(); test(!ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(ls.active_user_count() == 0); ls.login("Margo", "Din0s4ur5!"); ls.login("Berta", "!sc00p0f00d!"); ls.logout_everyone(); test(!ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(ls.active_user_count() == 0); ls.logout_everyone(); test(!ls.is_logged_in("Ernesto")); test(!ls.is_logged_in("Ruby")); test(!ls.is_logged_in("Hugo")); test(!ls.is_logged_in("Margo")); test(!ls.is_logged_in("Berta")); test(ls.active_user_count() == 0); // Test change_password() test(ls.login("Ernesto", "p455w0rd")); ls.logout("Ernesto"); test(!ls.login("Ernesto", "p455w0rd!")); test(!ls.login("Ernesto", "d1ff3r3nt!")); ls.change_password("Ernesto", "p455w0rd", "p455w0rd!"); test(!ls.login("Ernesto", "p455w0rd")); test(ls.login("Ernesto", "p455w0rd!")); ls.logout("Ernesto"); test(!ls.login("Ernesto", "d1ff3r3nt!")); ls.change_password("Ernesto", "p455w0rd!", "d1ff3r3nt!"); test(!ls.login("Ernesto", "p455w0rd")); test(!ls.login("Ernesto", "p455w0rd!")); test(ls.login("Ernesto", "d1ff3r3nt!")); ls.logout("Ernesto"); test(!ls.change_password("Ernesto", "wr0ng", "wr0ng2")); test(!ls.login("Ernesto", "p455w0rd")); test(!ls.login("Ernesto", "p455w0rd!")); test(ls.login("Ernesto", "d1ff3r3nt!")); ls.logout("Ernesto"); test(!ls.change_password("Ernesto", "p455w0rd", "wr0ng2")); test(!ls.login("Ernesto", "p455w0rd")); test(!ls.login("Ernesto", "p455w0rd!")); test(ls.login("Ernesto", "d1ff3r3nt!")); ls.logout("Ernesto"); // Try to change the password of a user that doesn't exist test(!ls.change_password("Stranger", "Question!", "Question!2")); test(!ls.is_logged_in("Stranger")); test(ls.total_user_count() == 5); test(!ls.login("Stranger", "Question!")); test(!ls.login("Stranger", "Question!2")); // Test delete_user() test(ls.delete_user("Ernesto", "d1ff3r3nt!")); test(ls.total_user_count() == 4); // Try to delete a user by giving the wrong password test(!ls.delete_user("Ruby", "NoErTy345")); test(ls.total_user_count() == 4); test(ls.login("Ruby", "QwErTy123")); ls.logout("Ruby"); // Try to delete users that don't exist test(!ls.delete_user("Unknown", "p455w0rd")); test(ls.total_user_count() == 4); test(!ls.delete_user("Ernesto", "d1ff3r3nt!")); test(ls.total_user_count() == 4); cout << "Assignment complete." << endl; }