how iterate retrograde by an stl list?

i'm minute cross-platform formula between windows mac.

if list::end() "returns an iterator addresses plcae unbroken final component list" checked traversing list forward, best proceed camber backwards?

this formula workson mac nonetheless windows (can't decrement over initial element):

list<dvfgfxobj*>::iterator iter = m_objs.end();
for (iter--; iter!=m_objs.end(); iter--)// collision detected iterator spin ?
{
}

this works windows:

list<dvfgfxobj*>::iterator iter = m_objs.end();
    do{
        iter--;
    } while (*iter != *m_objs.begin());

is there another proceed camber behind implemented loop?

code1