Hi all,
just started playing with boost::shared_ptr.
How do I get a const iterator pointing to a shared_ptr pointing to a
const object? See code below, I'd like to prevent a MyItem being changed
through const iterators.
struct MyItem
{
int value;
};
struct MyContainer
{
typedef std::set MySet;
MySet set;
};
int main(int argc, char* argv[])
{
MyContainer mc;
boost::shared_ptr<MyItem> p(new MyItem);
p->value = 5;
mc.set.insert(p);
MyContainer::MySet::const_iterator i = mc.set.begin();
// cannot mutate shared_ptr pointed to by iterator: ok
//(*i).reset(new MyItem);
// cannot change ptr but can change value: ok
(*i)->value = 6;
MyContainer::MySet::iterator j = mc.set.begin();
(*j).reset(new MyItem);
// how to do this?
// should not change ptr nor MyItem
std::set::const_iterator k =
mc.set.begin();
return 0;
}
