Comments on: Another C++ quiz, simpler

By: Victor Sergienko

Victor Sergienko — Tue, 04 Nov 2008 07:54:11 +0000

Astra, right.
Interesting thing is that same “pointer” variable keeps two values, which is not evident.

By: Astra

Astra — Mon, 03 Nov 2008 22:24:49 +0000

Probably repeating your answer, but this is indeed quite natural.

p = &A::f;
is a pointer to a virtual function and compiler knows it, therefore it is a pointer to an entry in vtable (of pb object) and is treated by compiler as such.

p = &A::g;
is a pointer to a regular function and compiler knows it, therefore it is a pointer into the chunk of memory that contains the code of A::g() function. Compiler just does type matching whether p function makes sense for bp object.

By: Fiberglass flowers / C++ quiz from the past

Fiberglass flowers / C++ quiz from the past — Wed, 14 May 2008 12:16:34 +0000

[...] take another, simpler C++ quiz about member pointers. Please bookmark this post: These icons link to social bookmarking sites where readers can share [...]

By: Victor Sergienko

Victor Sergienko — Tue, 13 May 2008 22:48:57 +0000

Both MSVC and gcc print:

B::f()
A::g()

which means member function pointer keeps both function address and VMT index.
And probably a flag telling if it’s virtual.