C++ STL: list with Pointers - Iterator cannot access?

Question

I am struggeling with an STL list that holds Pointers of my "Object" object.

I declared:

list<Object*> objectlist;

and inserted via:

this->objectlist.push_back(new Object(address,value,profit));

and tried to iterate like in maps and others:

list<Object*>::iterator iter;

iter = this->objectlist.begin();

while(iter != this->objectlist.end())
{
    iter->print();
}

Where print() is a public Method of class Object;

Whats wrong here?

I cannot access via iterator to the objects in the list ?

Answer 1

You need (*iter)->print();

Since you have an iterator to a pointer, you have to first de-reference the iterator (which gets you the Object*) then the arrow de-references the Object * and allows the call to print.

Answer 2

You are not incrementing your iterator! Change your while loop to a for loop like so:

for (list<Object*>::const_iterator iter = this->objectlist.begin(),
     end = this->objectlist.end();
     iter != end;
     ++iter)
{
    (*iter)->print();
}

(Also iter dereferences to a pointer, like the other answers have pointed out.)

Answer 3

You can access the value pointed by iterator with *iter

Also, remember to increment the iterator in each iteration. Otherwise you get stuck in an endless loop.

Like this:

iter = this->objectlist.begin();

while(iter != this->objectlist.end())
{
    (*iter)->print();
    iter++;
}