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kasiyil
Guest
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 Posted: Thu Aug 24, 2006 9:10 am Post subject: Destructor & Constructor Question |
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Hello,
I have a question about constructors and destructors in C++. Assume
that I declared a class that has a constructor and virtual destructor
like below:
class X {
X() { printf ("Hi\n"); }
virtual ~X() { }
}
When I derive a class from X called Y, and do not define any
constructor or destructor;
class Y : public X {
void hi() { printf ("Hiiiiiii\n"); }
}
what is the behaivour of the compiler? Does the compiler generates a
constructor that automatically calls X's constuctor? Does the compiler
generates a virtual destructor automatically? Do I need to implement a
virtual destructor? |
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Rolf Magnus
Guest
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| Posted: Thu Aug 24, 2006 9:10 am Post subject: Re: Destructor & Constructor Question |
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kasiyil wrote:
| Quote: | class X {
X() { printf ("Hi\n"); }
virtual ~X() { }
}
class Y : public X {
void hi() { printf ("Hiiiiiii\n"); }
}
what is the behaivour of the compiler? Does the compiler generates a
constructor that automatically calls X's constuctor?
|
Yes.
| Quote: | Does the compiler generates a virtual destructor automatically?
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Yes.
| Quote: | Do I need to implement a virtual destructor?
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Depends on what Y does. If you need to do something on its destruction, yes.
Otherwise, the compiler-generated one will be fine. |
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