initializing structure in a class

I'm doing an practice exercise from a book and I am having problems with initializing an array structure in a class.
I get multiple errors. one says a brace-enclosed initializer is not allowed here before '{' token.
another says ISO c++ forbids initialization of member 'drink'
third -making 'drink' satic
fourth error -invalid in class initialization of static data member of non integral type drinkInfo[3]
Can you help me find the error in the code?

Code:

---

#include <iostream>
#include <string>
using namespace std;



struct drinkInfo{
    string name;
    double price;
    int quantity;

    drinkInfo(string n, double p, int q){
        name = n;
        price = p;
        quantity = q;
    }

};


class machine {
    private:
        drinkInfo drink[3] = { drinkInfo("cola", 0.75, 20),
                              drinkInfo("sprite", 0.75, 20),
                              drinkInfo("root beer", 0.75, 20) };

};

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You can't initialize data in the class definition: that's what the constructor is for. In this case, you probably want to use a const object, which must also be initialized in construction.

The only one that's different are static consts. As it certainly can't be initialized on construction because it's static, a static const has slightly different syntax:

Code:

---

class machine {
    private:
        static const drinkInfo drink[3];
};

const drinkInfo machine::drink[3] = { drinkInfo("cola", 0.75, 20),
                                        drinkInfo("sprite", 0.75, 20),
                                        drinkInfo("root beer", 0.75, 20) };

---

Hope it helps.

You need to initialize it in constructor. Here you've to declare it only.

thanks Thinias that got it working. Is it possible to have a structure inside a class?

Quote:

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Originally Posted by diego

Is it possible to have a structure inside a class?

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Yes (in fact, classes are structures, and you can have one struct inside another).