Re: [Boost-users] [boost.intrusive] Assertion failure with SunCC

On Mon, Jun 04, 2007 at 08:54:03PM +0200, Ion Gaztañaga wrote:

I'm a bit puzzled, because it seems odd that the hook is not aligned to 4 bytes even if you have a char between data and the hook. The compiler might be reordering things a bit.

No, the data stored in the pointer-to-member is *not* the "real" offset, contrary to your assumption :) When checking in the debugger, the hook is aligned properly.

Could you check the real distance between klass and hook_? Something like:

The statement (after adding 'klass k' in the local scope of main()) cout << (char*)&k.hook_ - (char*)&k << endl; prints out 84. Furthermore, given the following program: == #include struct klass { void *data_klass[10]; boost::intrusive::list_member_hook<> hook_; typedef boost::intrusive::list< boost::intrusive::list_member_hook<>::value_traits< klass, &klass::hook_>, false> list; }; static klass Gd; static klass::list Gl; int main(void) { Gl.push_back(Gd); return 0; } == I step the execution to list::push_back and its first statement node_ptr to_insert = ValueTraits::to_node_ptr(value); The debugger reports: (dbx) print -r *to_insert *to_insert = { node::prev_ = (nil) node::next_ = (nil) } (dbx) p to_insert to_insert = 0x8062e2c (dbx) up Current function is main 19 Gl.push_back(Gd); (dbx) p &Gd &Gd = 0x8062e2c So, the "to_insert" does not point to the hook address, but to the very beginning of the structure. BTW, this is with SunStudio 12: CC: Sun C++ 5.9 SunOS_i386 2007/05/03