derived « constructor « C Q&A

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C Q&A » constructor » derived 

1. Is the possible to have all the public constructors of the publicbase class as the constructors of a derived class?    bytes.com

Hi, I want B has all the constructors that A has. Obviously, the code below would not work. I could define a corresponding B's constructor for each A's constructor. But if A has many constructors, it would be inconvenient. I'm wondering if there is any way to inherent all A's constructor implicitly. Thanks, Peng class A{ public: A(int x) : _x(x) ...

2. How to use a derived class with constructor    bytes.com

Hello I want to use polymorphic feature. Eg if I had a base Shape class and a derived Circle class I could do things like this: Shape myShape; MyCircle* pCircle = &myShape; pCircle->SetValues(3,5); cout << pCircle->area(); But my derived class has a constructor which gets passed variables. Eg Derived(int var1, std::string var2) So how do I instantiate it? I tried Derived* ...

3. Question about derived class and copy constructors....    bytes.com

Jeroen Hi all, I wrote a little bit of code to see the behaviour of (copy) constructors of base and derived classes. But I have a question about it. Let me explain by the following (incomplete/illustrative) code: class A { // (copy) ctors goe here... }; class B : public A { // (copy) ctors goe here... }; void foo(A a) ...

4. Derived Class Constructors    bytes.com

Hi, I apologize in advance if this is a very dumb question. I've been struggling with this problem for some time: I have an abstract base class called Base and n derived classes D1, D2, ....Dn. I would like to have a constructor for each derived class that takes any of the other derived classes as an argument so that these ...

5. Exception in a derived class constructor    bytes.com

Some amount of memory is allocated inside the Base Constructor using new. During the construction of a derived object an exception occurred in the constructor of the derived class. Will the memory get de allocated which got allocated in Base class constructor? Will the Base class destructor get called? class Base { int *p; public: B() { p = new int[100]; ...

6. Constructor of a derived class    bytes.com

The parent is an abstract class, with default implicit constructor: ----------------------------------- class mhwidget { public: virtual void draw()= 0; virtual void setPosition(GLint, GLint)= 0; virtual void setWidth(GLint)= 0; virtual void setHeight(GLint)= 0; virtual bool isMouseOver(GLint, GLint)= 0; virtual ~mhwidget() {} }; ------------------------------------ The derived class I've written use a simple constructor, because the parent have the default constructor. And without destructor. ...

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