Are they any compilers that do this? Or is this just speculation? Sorry if I'm overly skeptical, but your tone in the description above sounds sort of like -- "they totally could do this! Chenna Reddy Chenna Reddy 1, 17 17 silver badges 17 17 bronze badges. For compilers that operate on single TUs only, they can only inline implicitly functions that they have the definition for. A function can only be defined in multiple TUs if you make it inline. Jonathan Leffler k gold badges silver badges bronze badges.
When you call a base class method from the same or derived class the call is unambiguous and non-virtual — sharptooth. The compiler can inline functions you don't ask it to, and it probably knows better when to inline or not. Let it decide. I only objected to the statement that virtual finctions are resolved at runtime - this is true only when the call is done virtually, not for the exact class. I believe that's nonsense. Any function can always be inlined, no matter how big it is or whether it's virtual or not.
It depends on how the compiler was written. If you do not agree, then I expect that your compiler cannot produce non-inlined code either. That is: The compiler can include code that at runtime tests for the conditions it could not resolve at compile-time. The 4. I first encountered problems with this codebase using a 4.
Guess my info is out of date, edited. Balthazar Balthazar 1 1 silver badge 11 11 bronze badges. I have no idea if it exists in the compiler shipped with VS, because I am using an older version because some SDK only works with that properly :- I just wanted to add that not only marking them as inline can mean something, but might even make your code not build in some rare circumstances!
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Linked 9. See more linked questions. The primary time an inline virtual function makes sense is if you have a performance critical situation, and know that a class will frequently be used in a way that allows the compiler to determine the actual type statically and at least one target compiler optimizes out the call via pointer.
In order to answer this question fully, one needs to understand that the property of being virtual applies independently to the function itself and to the calls made to that function. There are virtual and non-virtual functions. There are virtual and non-virtual calls to these functions. The same is true about the property of being inline.
There are iniline and non-inline functions. And there are inlined and non-inlined calls to these functions. These properties - virtual and inline - when applied to the function itself, do not conflict. Virtual function ensure that the correct function is called for an object, regardless of the type of reference or pointer used for function call.
Functions are declared with a virtual keyword in base class. They are mainly used to achieve runtime polymorphism. Inline function is a normal function which is defined by the keyword inline, it is a short function which is expanded by the compiler and its arguments are evaluated only once. When an inline function is called, the compiler replaces all the calling statements with the function definition at run-time. The declaration and definition of the class are placed in the same file.
This is called implicit inlining. The third c is inherited from the base class. When calling a, This is called "polymorphism. This is the code I have seen by a virtual function: B is not plus Virtual, so it will not appear in the virtual function table, but it does not add Virtual, the final effect is the same.
First, for
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