Question

I have three classes; their function definitions are in a sperate file.
I’m trying to construct an object with various parameters inside another class without using inline implementation.

class A{     
     public:
       A(){}  
};

class B{         
     public:
         //takes in two ints, one reference to object, and a string 
         B(int x, int y, A &a, std::string s );
};

class C{        
    public:            
        //in the constructor, construct b_obj with its parameters 
        C();

    private:
        B b_obj;
 };

How can I make the C constructor construct b_obj with its parameters of the int, the reference to an instance of A, and the string? I tried some methods but I get an error that complains about no match call to the b_obj constructor.

Answer 1

You need to pass the relevant items to a constructor of object C, and then use an initializer.

class C {
    public:
        C(int x, int y, A& a, std::string s) : b_obj(x, y, a, s) {}