вход функции ниже хранится в списке, и он является изменчивым. Могу ли я сохранить список или вектор в файле, чтобы он был постоянным, удаляя или изменяя все в нем, открывая сам файл.я пытался добавить файл, но он не работал. файл хранит входные данные в очереди, поэтому каждый раз, когда я пытаюсь получить доступ к значению внутри очереди, не могу
void Flight::addFlight(){
/* ----INITIALISE VARS----*/
bool flag = false; // used in loops
/* --Check for arrival, departure time validity (USED ONLY IN BOARDING & ARRIVING TIME)-- */
vector<string> fields; // stores, splitted, user input to be checked
string temp; // stores user's input temp
char* pch; // stores result of function strtok()
int hour; // stores hour
int min; // store minutes
cout << "Add new flights by giving the following attributes: \n";
// clean stream
cin.clear();
cin.ignore(256,'\n');
/* --FLIGHT NUBMER-- */
cout << "Flight Number: ";
// get user's input
getline(cin, temp);
do{
flag = true;
// check input
if (!checkNumber(temp)){
cout << "Please insert a valid Flight Number! " << endl;
flag = false;
getline(cin, temp);
}else if (Flight::flightExists( atoi(temp.c_str()) )) {
cout << "This Flight already exists!" << endl;
cout << "Please insert a valid Flight Number!" << endl;
flag = false;
getline(cin, temp);
}else {
flag = true;
this -> flightNo = atoi(temp.c_str());
}
}while(!flag);
/* --DEPARTURE-- */
cout << "Departure: ";
flag = false;
// check input
LOOP:do{
getline(cin, temp);
if ( (temp.length() <= 10) && (checkString(temp)) ){
this -> from = temp;
flag = true;
}else {
cout << "Please insert a valid Departure city! ";
goto LOOP;
}
}while(!flag);
/* --DESTINATION-- */
cout << "Destination: ";
flag = false;
// check input
LOOP2:do{
getline(cin, temp);
if ( (temp.length() <= 10) && (checkString(temp)) && (temp.compare(this -> from)) ){
this -> to = temp;
flag = true;
}else{
cout << "Please insert a valid Destination city! ";
goto LOOP2;
}
}while(!flag);
/* --DEPARTURE TIME-- */
cout << "Boarding time (e.g. 19:40): "; //ask from user for the boarding time
flag = false;
// check input
LOOP3:do{
getline(cin, temp);
if( temp.length() != 5 || !checkTime(temp) ){
cout << "Please insert a valid boarding time (e.g. 19:40)! ";
goto LOOP3;
}
char t_temp[temp.length()];
strcpy(t_temp, temp.c_str());
//split string
pch = strtok(t_temp, ":");
while(pch != NULL){
fields.push_back(pch);
pch = strtok(NULL, ":");
}
hour = atoi(fields[0].c_str());
min = atoi(fields[1].c_str());
// check time
if ((hour >=0 && hour<=23) && (min>=0 && min <=59)){
this -> t_leave.hour = hour;
this -> t_leave.min = min;
flag = true;
}else{
cout << "Please insert a valid boarding time (e.g. 19:40)! ";
fields.clear();
}
}while(!flag);
/* --ARRIVAL TIME-- */
cout << "Arriving time (e.g. 21:40): ";
flag = false;
fields.clear(); // clear fields (because it was used before, at "DEPARTURE TIME")
// check input
LOOP4:do{
getline(cin, temp);
if( temp.length() > 5 || !checkTime(temp) ){
cout << "Please insert a valid boarding time (e.g. 19:40)! ";
goto LOOP4;
}
char t_temp[temp.length()];
strcpy(t_temp, temp.c_str());
//split string
pch = strtok(t_temp, ":");
while(pch != NULL){
fields.push_back(pch);
pch = strtok(NULL, ":");
}
hour = atoi(fields[0].c_str());
min = atoi(fields[1].c_str());
// check validity of time
if ((hour >=0 && hour<=23) && (min>=0 && min <=59)){
this -> t_arrive.hour = hour;
this -> t_arrive.min = min;
flag = true;
}else{
cout << "Please insert a valid arriving time (e.g. 19:40)! ";
fields.clear();
}
}while(!flag);
/* --TICKET COST-- */
cout << "Ticket price: ";
LOOP5:do{
getline(cin, temp);
flag = true;
// check input
if (!checkNumber(temp)){
cout << "Please insert a valid ticket price!" << endl;
flag = false;
goto LOOP5;
}else{
flag = true;
this -> cost = atoi(temp.c_str());
}
}while(!flag);
/* --AIRCRAFT TYPE-- */
cout << "Aeroplane type: ";
getline(cin, this -> plane_type);
while(this -> plane_type.empty()){
cout << "Please insert a valid Aeroplane type!" << endl;
getline(cin, this -> plane_type);
}
/* --No OF SEATS-- */
cout << "Number of seats: ";
LOOP6:do{
getline(cin, temp);
flag = true;
// check input
if (!checkNumber(temp)){
cout << "Please insert a valid number of seats!" << endl;
flag = false;
goto LOOP6;
}else{
flag = true;
this -> seats = atoi(temp.c_str());
}
}while(!flag);
/* --No of BOOKED SEATS-- */
cout << "Number of booked seats: ";
LOOP7:do{
getline(cin, temp);
flag = true;
// check input
if (!checkNumber(temp)){
cout << "Please insert a valid number of booked seats!" << endl;
flag = false;
goto LOOP7;
}else if ( atoi(temp.c_str()) > this -> seats ) {
cout << "Booked seats must be less than plane's seats!" << endl;
flag = false;
goto LOOP7;
}else {
flag = true;
this -> booked_seats = atoi(temp.c_str());
}
}while(!flag);
cout << endl;
flist.push_back(*this); // add object to the flist
Queue q(this -> flightNo); // create new queue for the newly added flight
qlist.push_back(q); // add object to the qlist
cout << "Flight No: "<< this -> flightNo << " was successfully added!" << endl;
}
void Flight::write_train(){
fp.open("Flight.dat",ios::out|ios::app);
f.addFlight();
fp.write((char*)&f,sizeof(Flight));
fp.close();
cout<<"\n\nThe Trip Has Been Added ";
getch();
}
void Flight::deleteFlight(int num){
fp.open("Flight.dat",ios::in);
while(fp.read((char*)&f,sizeof(Flight))){
for (std::list<Queue>::iterator i = qlist.begin(); i != qlist.end(); ++i){
if( num == i -> getNo() ){
// enter if waiting queue for the flight is NOT empty
if (!i -> isEmpty()) {
// delete object from flist
for (std::list<Flight>::iterator i2 = flist.begin(); i2 != flist.end(); ++i2){
if( num == (i2 -> flightNo) ){
i2 = flist.erase(i2);
i = qlist.erase(i);
cout << "Flight with number: " << num << " was successfully deleted" << endl;
return;
}
}
}else{
cout << "There are passengers in the queue of the flight with No: " << num << endl;
cout << "Remove ALL of them from the queue first!" << endl;
return;
}
}
}
}
fp.close();
cout << "This flight number doesn't exist!" << endl;
return;
}