I think I found the root cause of the "bug", padding of the data structure for 64 bit alignment which is revealed by looking at the sizeof() different structs. struct A { int x; // 4 bytes } struct B { int y; // 4 bytes } struct C : A, B { int z; // 12 bytes } struct D : A, B { virtual ~D(){} // 8 bytes for virtual table ptr int z; // 4 bytes } sizeof(C) == 12 sizeof(D) == 24 In other words, the presence of a virtual pointer added 12 bytes instead of 8 bytes which implies the compiler is padding the data structure. If I change A::x to int64_t then everything works as expected, there is no unaccounted for "padding". Dan On Feb 11, 2010, at 12:59 PM, John Maddock wrote:
cast the bool to an int, still does not work. It works for most cases, for example this works:
struct C : public A, public B { virtual test(); // }
struct C : public A, public B { virtual test(); float parameter; // DOESN"T WORK ANY MORE };
Which specific compiler version? I need something that I can reproduce here... John.
_______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost