C++ calling multiple constructors

Question

I am trying to accomplish the following: I have 4 classes(lets call one primary, other 3 secondary ones) within one namespace, I want to store instances of secondary classes as private members of primary, to do this I need to call secondary constructors from primary's one and then store instances. But Unfortunately I do not completely understand how to do it (not really experienced with c++): here is what I have in header file:

    class secondary_one
    {
    private:
        int number1;
    public:
        secondary_one(int);
        int get_number1() const;
    };

    class secondary_two
    {
    private:
        int number2;
    public:
        secondary_two(int);
        int get_number2() const;
    };

    class secondary_three
    {
    private:
        int number3;
    public:
        secondary_three(int);
        int get_number3() const;
    };

And 'primary' class is:

class primary
{
private:
    secondary_one one;
    secondary_two two;
    secondary_three three;
public:
    primary(int,int,int);
};

Upon calling primary constructor I want first argument to be send to constructor of secondary_one, second argument to constructor of secondary_two and so on. And then store instances as private members. Is it even possible or I am just wasting time? If it is, can you give a short example what should I have in header and source file?

juanchopanza · Accepted Answer · 2014-09-18 18:21:43Z

5

Use the constructor initialization list:

class primary
{
public:
  primary(int a, int b, int c) : one(a), two(b), three(c) {}
private:
    secondary_one one;
    secondary_two two;
    secondary_three three;
};

answered Sep 18, 2014 at 18:21

juanchopanza

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