CODEWITHSUNDEEP
c++arrayslistclassinitialization
Naama
Naama

Reputation: 23

initialize class array in initialization list c++

I have this class:

class Taxi {
   Wheel myWheel[4];
public:
   Taxi();
};

and Wheel is another class contain:

class Wheel{
   int radius,
       tickness;
public:
   Wheel(int,int);
};

now, what i want to do is to initialize "myWheel[4]" in initialization list of Taxi constructor, like this:

Taxi::Taxi () :Wheel[0](5,5), Wheel[1](3,3), Wheel[2](5,5), Wheel[3](3,3) {
   cout << "Ctor of Taxi" << endl;
}

but it doesn't work and i really need some HELP, thanks :)

Upvotes: 1

Views: 1510

Answers (2)

πάντα ῥεῖ
πάντα ῥεῖ

Reputation: 1

Your initialization list should look like 

Taxi::Taxi () : myWheel { Wheel(5,5), Wheel(3,3), Wheel(5,5), Wheel(3,3)} {
   cout << "Ctor of Taxi" << endl;
}

See a LIVE DEMO

If you don't have a compiler compliant with the current c++ standard (c++11), there's no way to do this in the member initializer list. You have to initialize the array elements inside the constructor's body:

Taxi::Taxi () {
   cout << "Ctor of Taxi" << endl;
   myWheel[0] = Wheel(5,5);
   myWheel[1] = Wheel(3,3);
   myWheel[2] = Wheel(5,5); 
   myWheel[3] = Wheel(3,3);
}

Also note you should make Wheel a nice class then.

Upvotes: 7

Some programmer dude
Some programmer dude

Reputation: 409136

You can only initialize arrays if you have a C++11 capable compiler, and then you can do

Taxi::Taxi () :myWheel{{5,5}, {3,3}, {5,5}, {3,3}} { ... }

If you don't have a C++11 capable compiler, then you have to initialize the array manually:

Taxi::Taxi()
{
    myWheel[0] = Wheel(5, 5);
    myWheel[1] = Wheel(3, 3);
    myWheel[2] = Wheel(5, 5);
    myWheel[3] = Wheel(3, 3);
}

Upvotes: 3

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