Hello everyone,
I have learned public/private/protected inheritance, but what is virtual inheritance Here is the sample,
class Usable : public virtual Usable_lock
http://www.research.att.com/~bs/bs_faq2.html#no-derivation
thanks in advance,
George
George2
Re: Visual C++ Language Virtual inheritance
einaros
Virtual inheritance ensures that the most derived class in a class hierarchy contains one and only one instance of virtually inherited classes up the tree. So if D derives from A in more than one branch up the tree, only one common instance will be kept at the bottom.
Virtual inheritance ensures that the most derived class in a class hierarchy contains one and only one instance of virtually inherited classes up the tree. So if D derives from A in more than one branch up the tree, only one common instance will be kept at the bottom.
Re: Visual C++ Language Virtual inheritance
Pintu Shukla
When multiple inheritance is used.To avoid the duplicated base class , you should use the virtual keyword in the inheritance .
virtual inheritance
Thanx
When multiple inheritance is used.To avoid the duplicated base class , you should use the virtual keyword in the inheritance .
virtual inheritance
Thanx
Re: Visual C++ Language Virtual inheritance
George2
Thanks einaros,
einaros wrote:
Virtual inheritance ensures that the most derived class in a class hierarchy contains one and only one instance of virtually inherited classes up the tree. So if D derives from A in more than one branch up the tree, only one common instance will be kept at the bottom.
Very clear answer.
regards,
George
Re: Visual C++ Language Virtual inheritance
George2
Thanks Pintu,
When multiple inheritance is used.To avoid the duplicated base class , you should use the virtual keyword in the inheritance .
virtual inheritance
Thanx
Good to learn from you again!
regards,
George
Re: Visual C++ Language Virtual inheritance
Pintu Shukla
Another way is to understand the concept is Following mention . have a look on the code.
A Complication can be arise with multiple inheritance. if the Direct base classes are themselves derived from another class. The Possibilities arise here that both the base class could be derived from a common class. As we can see in above code.the duplication of the member of indirect base class can be confusing . and can aise a lots of problem. to avoid this problem we used virtual inheritance.
Specify the base as virtual instruct the compiler to make sure that the data member are not duplicated in the derived class Even if there are multiple occurence of the class as as indirect class.
Thanx
Another way is to understand the concept is Following mention . have a look on the code.
Code Block
class A : public B
{
};
class C: public B
{
};
A Complication can be arise with multiple inheritance. if the Direct base classes are themselves derived from another class. The Possibilities arise here that both the base class could be derived from a common class. As we can see in above code.the duplication of the member of indirect base class can be confusing . and can aise a lots of problem. to avoid this problem we used virtual inheritance.
Specify the base as virtual instruct the compiler to make sure that the data member are not duplicated in the derived class Even if there are multiple occurence of the class as as indirect class.
Code Block
class A : public virtual B
{
};
class C: public virtual B
{
};
Thanx
Re: Visual C++ Language Virtual inheritance
George2
Thanks Pintu,
Good to learn from you again. I am clear now.
Another way is to understand the concept is Following mention . have a look on the code.
Code Blockclass A : public B
{
};
class C: public B
{
};
A Complication can be arise with multiple inheritance. if the Direct base classes are themselves derived from another class. The Possibilities arise here that both the base class could be derived from a common class. As we can see in above code.the duplication of the member of indirect base class can be confusing . and can aise a lots of problem. to avoid this problem we used virtual inheritance.
Specify the base as virtual instruct the compiler to make sure that the data member are not duplicated in the derived class Even if there are multiple occurence of the class as as indirect class.Code Blockclass A : public virtual B
{
};
class C: public virtual B
{
};
Thanx
regards,
George