Hi all, I am writing a C Wrapper mechanism for C++ objects. Here the memory layout of the virtual table is very important. I am searching for the differences of memory layouts of the object/virtual pointer table(vtable) with various compilers (GCC, BC, VC++ etc). I found that there is a difference of the virtual tables between the GCC versions 2.96 and 3.2. The difference I found is in the offset for first virtual function pointer, * in GCC 2.96 4th pointer (12-16th bytes) is the pointer to the first virtual function, whereas * in GCC 3.2 3rd pointer (8-12th bytes) is the pointer to the first virtual function And in both GCC version I found that the pointer to the virtual destructor is placed just before the first virtual function pointer. Is this guarenteed always ?. Any help for me to figure out how GCC synthesizes an object is greatly appreciated. Thanks, Susantha.
