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Size of a empty Class & Derived Virtual Class


Size of a empty Class & Derived Virtual Class

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Size of a empty Class & Derived Virtual Class
Tag : cpp , By : pjkinney
Date : November 24 2020, 03:41 PM


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why size of extreme down Derived class (multiple virtual inheritance) includes two times of size of member of superclass


Tag : cpp , By : Lathentar
Date : March 29 2020, 07:55 AM
To fix this issue 24 is probably:
4 for Sb 4 for a 4 for b 4 for c 8 for the overhead of virtual inheritance.

size of derived class in virtual inheritance


Tag : cpp , By : cameron
Date : March 29 2020, 07:55 AM
this one helps. Virtual inheritance means, that the virtual base classes only exist once instead of multiple times. That is why the 8 bytes from ClassA are only in ClassD once. Virtual inheritance itself requires a certain overhead and hence you get an additional pointer. The exact implementation and therefore the exact overhead is not specified by the C++ standard and may vary depending on the hierarchy you are creating.

Why the virtual destructor in derived class is empty?


Tag : cpp , By : mckasty
Date : March 29 2020, 07:55 AM
This might help you I have one question, I see that in some codes, the virtual destructor in derived class is empty, then why we need it since it does nothing? Is it used to call the destructor in base class and without it, the destructor cannot be called? or it is just a notation to tell the code reader that this destructor is virtual which makes code much easier to read? ! ,
why we need it since it does nothing?

Derived class VTable having only base class virtual functions. The derived class virtual functions are missing from deri


Tag : cpp , By : Tim Coffman
Date : March 29 2020, 07:55 AM
it fixes the issue Here you have different function overloads that do not override the defined virtual functions:
virtual void sayHi() const {}
virtual void sayHello() {}

void sayHi() {}  // non virtual function with a different signature (no const)
void sayHello() const {} // non virtual function with a different signatuere (const)

Size of most derived class in virtual inheritance


Tag : cpp , By : SilverRuby
Date : September 30 2020, 08:00 PM
like below fixes the issue
I think because we have virtual base class so there should be only one instance of A.
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