Re: two questions about std::list...
SpreadTooThin wrote:
On Jun 12, 1:20 pm, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
SpreadTooThin wrote:
I want to replace an object in a list with a new object....
std::list<myObj>::iterator it;
for (it=mylist.begin(); it != mylist.end(); ++it)
{
if (it->compair(myval) == 0)
{
*it = newval;
}
}
will *it = newval replace the contents of the list with the new
data... and hopefully delete the old object?
It will not "delete the old object". It will simply invoke
myObj::operator=(newval);
(assign new value) for it.
How do I insert and object just before the last element in the list?
There is an 'insert' member function (overloaded) in std::list.
RTFM. You will need to supply the iterator to the [actual] last item
in the list (don't confuse it with the iterator returned by
'list::end()').
After RTFM
I came up with mylist.insert(mylist.end(), 1, object);
No good?
You could drop the '1'. However, the effects of
mylist.insert(mylist.end(), object); // no '1', same difference
are the same as
mylist.push_back(object);
and it _appends_ the value to the list, not inserts it _before_ the
last element. See Andre's solution.
V
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