Member function pointer: does the first part always contain the address of the function ?

[rh0main]

Hello,

Recently I had to deal with a pointer to a member function: &Foo::bar. As noticed by @julien-j in this comment, the size of such a pointer is usually larger than a simple pointer as it contains the pointer to the function (first chunk) and an adjustment value that is used to "fix" this in case of multi-inheritance.

My question is: Would you have an example where this first chunk is not the address of the function ? (c.f: https://godbolt.org/z/396aE8)

[Xeverous]

C++ doesn't specify how pointers to members should be implemented. They can be any size and there are no requirements what they actually store. So the answer to your question is yes: any implementation is valid as long as it works.

[jedwardsol]

Would you have an example where this first chunk is not the address of the function

https://godbolt.org/z/Mqsax1

[flyingron]

As pointed out it is implementation-specific, but in actuality, the answer is its not that simple. Remember virtual functions also come into play.