Virtual inline in C++

Is it possible to declare a virtual inline in C++? Does this poses a problem to the compilation and/or performance when the call for a virtual inline function is from a secondary purpose?

Quote:

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Originally Posted by Jacek

Is it possible to declare a virtual inline in C++?

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Yes

Quote:

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Originally Posted by Jacek

Does this poses a problem to the compilation and/or performance when the call for a virtual inline function is from a secondary purpose?

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No, it does not poses any problem.

What surprises me is that I thought during the compilation, the compiler does not know whether it is the type of object that calls the declared virtual (ie: depending on the parent class or function Class) and thus may not be able to inline code. Am I wrong?

No. It is quite rightly. But nothing prevents you declare virtual inline and nothing prevents a compiler to inline a call to a virtual function if he knows to resolve statically.

Here is what I could have a sample code, which highlights the call for a virtual inline from a subclass that the compiler knows to solve statically:

Code:

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class A
{
virtual inline f() {...}
};
class B: public A
{
virtual inline f() {...}
};
main ()
{
A * a;
a = new B();
a -> f();
}

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In this case the compiler can not inline a-> f () a priori as I understand it, but in which case it may do as you pointed out to me?

In a static:

Code:

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virtual void B::f() { A::f(); }
// Or
B b;
b.f();

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