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I've got a class A, which consists of objects B and C. How to write a constructor of A that gets B and C objects? Should I pass them by value, by (const) reference, or a pointer? Where should I deallocate them?
I thought about pointers, because then I could write:
A a(new B(1,2,3,4,5), new C('x','y','z'))
But I don't know whether it's a good practice or not. Any suggestions?
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You can only define the coursebookname variable one time (which is when you specify the type). Remove the String designation from before the variable name when you pass it to the Person constructor and it should work fine. Person p1 = new Person(cousebookname); Spelling aside.
Parameterized Constructors: It is possible to pass arguments to constructors. Typically, these arguments help initialize an object when it is created. To create a parameterized constructor, simply add parameters to it the way you would to any other function.
Constructors can also take parameters, which is used to initialize attributes.
In case you want to pass parameters to the constructor, you include the parameters between the parentheses after the class name, like this: MyClass myClassVar = new MyClass(1975); This example passes one parameter to the MyClass constructor that takes an int as parameter.
Usually you pass by const reference:
A a(B(1,2,3,4,5), C('x','y','z'))
No need for pointers here.
Usually you store values unless copying is too inefficient. The class definition then reads:
class A {
private:
B b;
C c;
public:
A(const B& b, const C& c): b(b), c(c) { }
};
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