STL cloning a vector

Question

!Hi I have a hard time trying to copy vector of pointers to Point. I have a

vector<Point*> oldVector

and I want to copy this vector into other vector. So I used a copying constructor. I did this that way

vector<Point*> newVector = vector<Point*>(oldVector.begin(),oldVector.end());

Unfortunately I get an exception/error if I ran this function.

vector interators incompatible

What may be the problem ??

EDIT There must be a bigger problem with iterators, it seems that I can't use iterators at all. I wanted to add two stl vectors into each other so I used wrote sth like this

 vector<int> a, b;
    b.insert(b.end(), a.begin(), a.end());

and I get the sama exception/error during execution of this line

Answer 1

That would be either

vector<Point*> *newVector = new vector<Point*>(oldVector.begin(),oldVector.end());

or

vector<Point*> newVector(oldVector.begin(),oldVector.end());

When creating objects, you only use assignment when allocating from the heap. Otherwise, you simply place the constructor argument(s) inside parentheses after your new variable name.

Alternatively, the following is much simpler:

vector<Point*> newVector(oldVector);

Answer 2

vector<Point*> newVector = vector<Point*>(oldVector.begin(),oldVector.end());

Why this?

Why not this:

vector<Point*> newVector(oldVector.begin(),oldVector.end());

??. The latter the better!

Even better is this,

vector<Point*> newVector(oldVector);