C++:: Call class method using vector iterator?
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23-10-2019 - |
Question
I have a class called Room, the Room class has setPrice and display function.
I stored room objects in a vector:
room.push_back(Room("r001", 1004, 2, "small"));
room.push_back(Room("r002", 1005, 2, "small"));
room.push_back(Room("r003", 2001, 4, "small"));
room.push_back(Room("r004", 2002, 4, "small"));
In my main function, i create a display function to display all rooms. Here is my code:
void displayRoom()
{
vector<Room>::iterator it;
for (it = room.begin(); it != room.end(); ++it) {
*it.display(); // just trying my luck to see if it works
}
}
But it does not call the Room's display method.
How do I call the Room(class)'s display method (no argument) and setPrice(1 argument) method?
Solution
Dereferencing has higher priority than member access. You could add parens ((*it).display()
), but you should just use the shortcut that was introduced long long ago (in C) for this: it->display()
.
Of course the same rule applies for pointers and everything else that can be dereferenced (other iterators, smart pointers, etc.).
OTHER TIPS
Try (*it).display()
or simply it->display()
.
Iterators are a bit like pointers. So you want either:
it->display();
or:
(*it).display();
Using Vector, you can also use classic form
for(size_t x = 0; x < room.size(); x++) {
room[x].display(); //for objects
//room[x]->display(); //for pointers
}